diff --git a/Customers/CustomsAviso.aspx.vb b/Customers/CustomsAviso.aspx.vb
index 591b765..a9b8f08 100644
--- a/Customers/CustomsAviso.aspx.vb
+++ b/Customers/CustomsAviso.aspx.vb
@@ -32,7 +32,7 @@ Partial Class CustomsAviso
             If Not csm1.IsStartupScriptRegistered(cstype, "Startup") Then
                 Dim string1 As String = "<script language=\""JavaScript\"">"
                 string1 += "</"
-                string1 += "window.addEventListener('beforeunload', (event) => {"
+                string1 += "window.addEventListener('onunload', (event) => {"
                 string1 += " event.preventDefault();"
                 string1 += "event.returnValue = '';"
                 string1 += "script>"
@@ -46,7 +46,9 @@ Partial Class CustomsAviso
                     Page.MaintainScrollPositionOnPostBack = True
                     normaltable.EnableViewState = True
 
-                    If rbt_Alle.Checked = True Then
+
+
+                If rbt_Alle.Checked = True Then
                         lbl_von.Visible = True
                         lbl_bis.Visible = True
                         valDateRange_1.Enabled = True
diff --git a/Customers/Invoices.aspx b/Customers/Invoices.aspx
index 9a818d6..0e73af2 100644
--- a/Customers/Invoices.aspx
+++ b/Customers/Invoices.aspx
@@ -26,17 +26,21 @@
     <link rel="stylesheet" type="text/css" href="../css/Dropdown.css"/>   
     <link rel="stylesheet" type="text/css" href="../css/Customers/MasterpageCustomers.css"/>       
     <link rel="stylesheet" type="text/css" href="../css/navbarsidebar2.css"/>      
-    <link rel="stylesheet" type="text/css" href="../css/Customers/Invoices.css"/>      
+    <link rel="stylesheet" type="text/css" href="../css/Customers/Invoices.css"/>    
 </asp:Content>
 
 <asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
      <asp:ScriptManager ID="script1" runat="server"></asp:ScriptManager>
     <asp:UpdatePanel ID="panelupdate1" runat="server"><ContentTemplate>
         <!-- Webiste-Content-->  
+       
+
 
         <div id="containerseiterand" style="margin-left:auto;margin-right:auto">
             <div class="container-fluid">
                 <div id="cont1">
+                   <asp:HiddenField ID="hidField" ClientIDMode="Static" runat="server" />
+       
                     <h1>Rechnungen</h1>
                     <div id="line" style="width:92%;"></div>
                     <br />
diff --git a/Customers/Invoices.aspx.vb b/Customers/Invoices.aspx.vb
index f261fc2..a435db0 100644
--- a/Customers/Invoices.aspx.vb
+++ b/Customers/Invoices.aspx.vb
@@ -26,6 +26,7 @@ Partial Class Customers_Default3
             Else
                 lbl_status.Text = "Dieser Bereich ist nicht gestattet! Ein Fehler ist bei der Validierung der ID aufgetreten! Bitte erneut versuchen!"
             End If
+            Dim confirmValue As String = hidField.Value
             'Script für Schließen wirklich verlassen Meldung auf der Masterseite für diese Seite zu registrieren und nicht ueberall
             Dim csm1 As ClientScriptManager = Page.ClientScript
             Dim cstype As Type = Page.GetType