diff --git a/abmelden.php b/abmelden.php
index 77159c3..da06b19 100644
--- a/abmelden.php
+++ b/abmelden.php
@@ -80,17 +80,7 @@
         <!--Link JS file-->
         <script src="burgerIcon.js"></script>
        
-        <script>
-            var widthissue = false;
-      window.addEventListener("resize", function(event) {
-        if(window.innerWidth > 800 && widthissue) {
-            widthissue = false
-            unset()
-        } 
-        else if(window.innerWidth < 800) widthissue = true;
-        })
-        
-        </script>
+        <script src="resize.js"></script>
 
         <nav id="activeid" class="active"></nav>
 
@@ -133,17 +123,7 @@
             <!--Link JS file-->
             <script src="burgerIcon.js"></script>
            
-            <script>
-                var widthissue = false;
-          window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-            })
-            
-            </script>
+            <script src="resize.js"></script>
     
             <nav id="activeid" class="active"></nav>
     
diff --git a/abmelden_erfolgreich.php b/abmelden_erfolgreich.php
index ddf46df..caab984 100644
--- a/abmelden_erfolgreich.php
+++ b/abmelden_erfolgreich.php
@@ -81,17 +81,7 @@ session_destroy();
     <!--Link JS file-->
     <script src="burgerIcon.js"></script>
     
-    <script>
-        var widthissue = false;
-  window.addEventListener("resize", function(event) {
-    if(window.innerWidth > 800 && widthissue) {
-        widthissue = false
-        unset()
-    } 
-    else if(window.innerWidth < 800) widthissue = true;
-    })
-    
-    </script>
+    <script src="resize.js"></script>
 
     <nav id="activeid" class="active"></nav>
 
diff --git a/anmelden.php b/anmelden.php
index 3faca0a..95fee17 100644
--- a/anmelden.php
+++ b/anmelden.php
@@ -105,16 +105,7 @@
                 </div>
         
                
-                <script>
-                    var widthissue = false;
-                    window.addEventListener("resize", function(event) {
-                        if(window.innerWidth > 800 && widthissue) {
-                            widthissue = false
-                            unset()
-                        }
-                        else if(window.innerWidth < 800) widthissue = true;
-                    })
-                </script>
+                <script src="resize.js"></script>
         
                 <nav id="activeid" class="active"></nav>
         
diff --git a/anmelden_meinebuecher.php b/anmelden_meinebuecher.php
index 8d75aed..5c98b01 100644
--- a/anmelden_meinebuecher.php
+++ b/anmelden_meinebuecher.php
@@ -105,16 +105,7 @@
             
                     </div>
             
-                    <script>
-                        var widthissue = false;
-                        window.addEventListener("resize", function(event) {
-                            if(window.innerWidth > 800 && widthissue) {
-                                widthissue = false
-                                unset()
-                            }
-                            else if(window.innerWidth < 800) widthissue = true;
-                        })
-                    </script>
+                    <script src="resize.js"></script>
             
                     <nav id="activeid" class="active"></nav>
             
diff --git a/benutzer_existiert_nicht.php b/benutzer_existiert_nicht.php
index 2fb2f6c..ef25a3d 100644
--- a/benutzer_existiert_nicht.php
+++ b/benutzer_existiert_nicht.php
@@ -76,17 +76,7 @@
         
                 <!--Link JS file-->
                 <script src="burgerIcon.js"></script>
-                <script>
-                    var widthissue = false;
-              window.addEventListener("resize", function(event) {
-                if(window.innerWidth > 800 && widthissue) {
-                    widthissue = false
-                    unset()
-                } 
-                else if(window.innerWidth < 800) widthissue = true;
-                })
-                
-                </script>
+            <script src="resize.js"></script>
 
             <nav id="activeid" class="active"></nav>
 
diff --git a/benutzer_schon_existiert.php b/benutzer_schon_existiert.php
index 5bd39c4..a52e978 100644
--- a/benutzer_schon_existiert.php
+++ b/benutzer_schon_existiert.php
@@ -76,17 +76,7 @@
         
                 <!--Link JS file-->
                 <script src="burgerIcon.js"></script>
-                <script>
-                    var widthissue = false;
-              window.addEventListener("resize", function(event) {
-                if(window.innerWidth > 800 && widthissue) {
-                    widthissue = false
-                    unset()
-                } 
-                else if(window.innerWidth < 800) widthissue = true;
-                })
-                
-                </script>
+            <script src="resize.js"></script>
 
             <nav id="activeid" class="active"></nav>
 
diff --git a/buch_details.php b/buch_details.php
index 8f2b722..2c51054 100644
--- a/buch_details.php
+++ b/buch_details.php
@@ -233,16 +233,7 @@
     <script src="burgerIcon.js"></script>
     <!--If it was small and got big, 
         it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-    </script>
+    <script src="resize.js"></script>
    
     <nav id="activeid" class="active"></nav>
    
diff --git a/buecher.php b/buecher.php
index daab82a..a9aef2a 100644
--- a/buecher.php
+++ b/buecher.php
@@ -210,17 +210,7 @@
    
            <!--Link JS file-->
            <script src="burgerIcon.js"></script>
-           <script>
-               var widthissue = false;
-         window.addEventListener("resize", function(event) {
-           if(window.innerWidth > 800 && widthissue) {
-               widthissue = false
-               unset()
-           } 
-           else if(window.innerWidth < 800) widthissue = true;
-   })
-           
-           </script>
+       <script src="resize.js"></script>
    <!--Burger-->
        <nav id="activeid" class="active"></nav>
 
diff --git a/datenschutz.php b/datenschutz.php
index ddde10c..43c00c3 100644
--- a/datenschutz.php
+++ b/datenschutz.php
@@ -172,16 +172,7 @@
     <script src="burgerIcon.js"></script>
     <!--If it was small and got big, 
         it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-    </script>
+    <script src="resize.js"></script>
    
     <nav id="activeid" class="active"></nav>
    
diff --git a/erweitertesuche.php b/erweitertesuche.php
index d34f7c9..368d21e 100644
--- a/erweitertesuche.php
+++ b/erweitertesuche.php
@@ -119,16 +119,7 @@
     <script src="burgerIcon.js"></script>
     <!--If it was small and got big, 
         it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-    </script>
+        <script src="resize.js"></script>
    
     <nav id="activeid" class="active"></nav>
    
diff --git a/impressum.php b/impressum.php
index 2f26b2b..c1f5fe1 100644
--- a/impressum.php
+++ b/impressum.php
@@ -76,16 +76,7 @@
     <script src="burgerIcon.js"></script>
     <!--If it was small and got big, 
         it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-    </script>
+    <script src="resize.js"></script>
    
     <nav id="activeid" class="active"></nav>
    
diff --git a/index.php b/index.php
index fac49eb..2beaeae 100644
--- a/index.php
+++ b/index.php
@@ -90,16 +90,7 @@
     <script src="burgerIcon.js"></script>
     <!--If it was small and got big, 
         it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-    </script>
+    <script src="resize.js"></script>
    
     <nav id="activeid" class="active"></nav>
    
diff --git a/kontakt.php b/kontakt.php
index 34f82fd..f99d91a 100644
--- a/kontakt.php
+++ b/kontakt.php
@@ -69,16 +69,7 @@
     <script src="burgerIcon.js"></script>
     <!--If it was small and got big, 
         it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-    </script>
+    <script src="resize.js"></script>
    
     <nav id="activeid" class="active"></nav>
    
diff --git a/loeschen_erfolgreich_meine_buecher.php b/loeschen_erfolgreich_meine_buecher.php
index 1704e7e..7e2adcf 100644
--- a/loeschen_erfolgreich_meine_buecher.php
+++ b/loeschen_erfolgreich_meine_buecher.php
@@ -68,17 +68,7 @@
 
 <!--Link JS file-->
 <!--If it was small and got big, it calls the function only one time and doesn't do it all the time-->
-<script>
-    var widthissue = false;
-    window.addEventListener("resize", function(event) {
-        if(window.innerWidth > 800 && widthissue) {
-            widthissue = false
-            unset()
-        }
-        else if(window.innerWidth < 800) widthissue = true;
-    })
-
-</script>
+<script src="resize.js"></script>
 
 <nav id="activeid" class="active"></nav>
 
diff --git a/loeschen_erfolgreich_warenkorb.php b/loeschen_erfolgreich_warenkorb.php
index 0154b8d..31cf01c 100644
--- a/loeschen_erfolgreich_warenkorb.php
+++ b/loeschen_erfolgreich_warenkorb.php
@@ -68,17 +68,7 @@
 
 <!--Link JS file-->
 <!--If it was small and got big, it calls the function only one time and doesn't do it all the time-->
-<script>
-  var widthissue = false;
-  window.addEventListener("resize", function(event) {
-    if(window.innerWidth > 800 && widthissue) {
-      widthissue = false
-      unset()
-    }
-    else if(window.innerWidth < 800) widthissue = true;
-  })
-
-</script>
+<script src="resize.js"></script>
 
 <nav id="activeid" class="active"></nav>
 
diff --git a/loeschen_meine_buecher.php b/loeschen_meine_buecher.php
index 60bd174..0a2f958 100644
--- a/loeschen_meine_buecher.php
+++ b/loeschen_meine_buecher.php
@@ -78,17 +78,7 @@
 
 <!--Link JS file-->
 <!--If it was small and got big, it calls the function only one time and doesn't do it all the time-->
-<script>
-  var widthissue = false;
-  window.addEventListener("resize", function(event) {
-    if(window.innerWidth > 800 && widthissue) {
-      widthissue = false
-      unset()
-    }
-    else if(window.innerWidth < 800) widthissue = true;
-  })
-
-</script>
+<script src="resize.js"></script>
 
 <nav id="activeid" class="active"></nav>
 
diff --git a/loeschen_warenkorb.php b/loeschen_warenkorb.php
index 9dbe4e6..2829574 100644
--- a/loeschen_warenkorb.php
+++ b/loeschen_warenkorb.php
@@ -78,17 +78,7 @@
 
 <!--Link JS file-->
 <!--If it was small and got big, it calls the function only one time and doesn't do it all the time-->
-<script>
-    var widthissue = false;
-    window.addEventListener("resize", function(event) {
-        if(window.innerWidth > 800 && widthissue) {
-            widthissue = false
-            unset()
-        }
-        else if(window.innerWidth < 800) widthissue = true;
-    })
-
-</script>
+<script src="resize.js"></script>
 
 <nav id="activeid" class="active"></nav>
 
diff --git a/meinebuecher.php b/meinebuecher.php
index 3a410f7..5672d30 100644
--- a/meinebuecher.php
+++ b/meinebuecher.php
@@ -215,17 +215,7 @@ if(isset($_POST['submit'])){
 
 <!--Link JS file-->
 <script src="burgerIcon.js"></script>
-<script>
-    var widthissue = false;
-    window.addEventListener("resize", function(event) {
-        if(window.innerWidth > 800 && widthissue) {
-            widthissue = false
-            unset()
-        }
-        else if(window.innerWidth < 800) widthissue = true;
-    })
-
-</script>
+<script src="resize.js"></script>
 <!--Burger-->
 <nav id="activeid" class="active"></nav>
 
diff --git a/passwort_stimmt_nicht.php b/passwort_stimmt_nicht.php
index 7b5ec02..4dc120b 100644
--- a/passwort_stimmt_nicht.php
+++ b/passwort_stimmt_nicht.php
@@ -76,17 +76,7 @@
         
                 <!--Link JS file-->
                 <script src="burgerIcon.js"></script>
-                <script>
-                    var widthissue = false;
-              window.addEventListener("resize", function(event) {
-                if(window.innerWidth > 800 && widthissue) {
-                    widthissue = false
-                    unset()
-                } 
-                else if(window.innerWidth < 800) widthissue = true;
-                })
-                
-                </script>
+            <script src="resize.js"></script>
 
             <nav id="activeid" class="active"></nav>
 
diff --git a/registriersystem.php b/registriersystem.php
index 8fcfd47..3128ce1 100644
--- a/registriersystem.php
+++ b/registriersystem.php
@@ -172,17 +172,7 @@ function register($vorname,
                         
                                 <!--Link JS file-->
                                 <script src="burgerIcon.js"></script>
-                                <script>
-                                    var widthissue = false;
-                            window.addEventListener("resize", function(event) {
-                                if(window.innerWidth > 800 && widthissue) {
-                                    widthissue = false
-                                    unset()
-                                } 
-                                else if(window.innerWidth < 800) widthissue = true;
-                                })
-                                
-                                </script>
+                                <script src="resize.js"></script>
                         
                                 <nav id="activeid" class="active"></nav>
                         
diff --git a/registrierung.php b/registrierung.php
index d0820ea..ead1be9 100644
--- a/registrierung.php
+++ b/registrierung.php
@@ -152,17 +152,7 @@ session_start();
                     <!--Link JS file-->
                     <script src="burgerIcon.js"></script>
                     
-                    <script>
-                        var widthissue = false;
-                  window.addEventListener("resize", function(event) {
-                    if(window.innerWidth > 800 && widthissue) {
-                        widthissue = false
-                        unset()
-                    } 
-                    else if(window.innerWidth < 800) widthissue = true;
-            })
-                    
-                    </script>
+                    <script src="resize.js"></script>
             
                     <nav id="activeid" class="active"></nav>
             
diff --git a/registrierung_wiederholen.php b/registrierung_wiederholen.php
index b33f9cd..4da79da 100644
--- a/registrierung_wiederholen.php
+++ b/registrierung_wiederholen.php
@@ -76,17 +76,7 @@
         
                 <!--Link JS file-->
                 <script src="burgerIcon.js"></script>
-                <script>
-                    var widthissue = false;
-              window.addEventListener("resize", function(event) {
-                if(window.innerWidth > 800 && widthissue) {
-                    widthissue = false
-                    unset()
-                } 
-                else if(window.innerWidth < 800) widthissue = true;
-                })
-                
-                </script>
+            <script src="resize.js"></script>
 
             <nav id="activeid" class="active"></nav>
 
diff --git a/reservierung.php b/reservierung.php
index 73a6778..37b9f42 100644
--- a/reservierung.php
+++ b/reservierung.php
@@ -232,16 +232,7 @@ TODO (optional):
     <script src="burgerIcon.js"></script>
     <!--If it was small and got big, 
         it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-    </script>
+    <script src="resize.js"></script>
    
     <nav id="activeid" class="active"></nav>
    
diff --git a/reservierung_bestaetigung.php b/reservierung_bestaetigung.php
index 1b24de1..4059007 100644
--- a/reservierung_bestaetigung.php
+++ b/reservierung_bestaetigung.php
@@ -74,17 +74,7 @@
 
     <!--Link JS file-->
     <!--If it was small and got big, it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            }
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-
-    </script>
+<script src="resize.js"></script>
 
 <nav id="activeid" class="active"></nav>
 
diff --git a/reservierung_original.php b/reservierung_original.php
index 627f1bd..98b964d 100644
--- a/reservierung_original.php
+++ b/reservierung_original.php
@@ -105,17 +105,7 @@
 
     <!--Link JS file-->
     <!--If it was small and got big, it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            }
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-
-    </script>
+<script src="resize.js"></script>
 
 <nav id="activeid" class="active"></nav>
 
diff --git a/resize.js b/resize.js
new file mode 100644
index 0000000..9e61c1b
--- /dev/null
+++ b/resize.js
@@ -0,0 +1,8 @@
+var widthissue = false;
+window.addEventListener("resize", function(event) {
+    if(window.innerWidth > 800 && widthissue) {
+        widthissue = false
+        unset()
+    }
+    else if(window.innerWidth < 800) widthissue = true;
+})
\ No newline at end of file
diff --git a/suchergebnisse.php b/suchergebnisse.php
index ba99a05..ebc6a8c 100644
--- a/suchergebnisse.php
+++ b/suchergebnisse.php
@@ -329,16 +329,7 @@
     <script src="burgerIcon.js"></script>
     <!--If it was small and got big, 
         it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-    </script>
+    <script src="resize.js"></script>
    
     <nav id="activeid" class="active"></nav>
    
diff --git a/uberuns.php b/uberuns.php
index 35d1286..59bb4f2 100644
--- a/uberuns.php
+++ b/uberuns.php
@@ -85,16 +85,7 @@
     <script src="burgerIcon.js"></script>
     <!--If it was small and got big, 
         it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-    </script>
+    <script src="resize.js"></script>
    
     <nav id="activeid" class="active"></nav>
    
diff --git a/verlaengerung.php b/verlaengerung.php
index ffed65d..283cfee 100644
--- a/verlaengerung.php
+++ b/verlaengerung.php
@@ -78,17 +78,7 @@
 
     <!--Link JS file-->
     <!--If it was small and got big, it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            }
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-
-    </script>
+<script src="resize.js"></script>
 
 <nav id="activeid" class="active"></nav>
 
diff --git a/verlaengerung_erfolgreich.php b/verlaengerung_erfolgreich.php
index 5d5bc43..c246de5 100644
--- a/verlaengerung_erfolgreich.php
+++ b/verlaengerung_erfolgreich.php
@@ -78,17 +78,7 @@
 
 <!--Link JS file-->
 <!--If it was small and got big, it calls the function only one time and doesn't do it all the time-->
-<script>
-    var widthissue = false;
-    window.addEventListener("resize", function(event) {
-        if(window.innerWidth > 800 && widthissue) {
-            widthissue = false
-            unset()
-        }
-        else if(window.innerWidth < 800) widthissue = true;
-    })
-
-</script>
+<script src="resize.js"></script>
 
 <nav id="activeid" class="active"></nav>
 
diff --git a/warenkorb.php b/warenkorb.php
index 942a05a..f427140 100644
--- a/warenkorb.php
+++ b/warenkorb.php
@@ -333,16 +333,7 @@ TODO (optional, geringe Priorität):
     <script src="burgerIcon.js"></script>
     <!--If it was small and got big, 
         it calls the function only one time and doesn't do it all the time-->
-    <script>
-        var widthissue = false;
-        window.addEventListener("resize", function(event) {
-            if(window.innerWidth > 800 && widthissue) {
-                widthissue = false
-                unset()
-            } 
-            else if(window.innerWidth < 800) widthissue = true;
-        })
-    </script>
+    <script src="resize.js"></script>
    
     <nav id="activeid" class="active"></nav>
    
diff --git a/warenkorb_original.php b/warenkorb_original.php
index 6e61113..cb868a3 100644
--- a/warenkorb_original.php
+++ b/warenkorb_original.php
@@ -100,17 +100,7 @@ $db_link = mysqli_connect('localhost', 'web_b-3', 'een7Ao6s', 'bibliothek_candle
                    </div>
                </div>
           
-           <script>
-               var widthissue = false;
-           window.addEventListener("resize", function(event) {
-           if(window.innerWidth > 800 && widthissue) {
-               widthissue = false
-               unset()
-           } 
-           else if(window.innerWidth < 800) widthissue = true;
-           })
-           
-           </script>
+           <script src="resize.js"></script>
    
            <nav id="activeid" class="active"></nav>