add page leave handler on image editor

website/agenda/planung/templates/image.html

@@ -1,6 +1,8 @@
 
 <link type="text/css" href="css/image_manager.css" rel="stylesheet"/>
 <script src="js/image.js" type="text/javascript"></script>
+<script src="js/page_leave_handler.js" type="text/javascript"></script>
+
 <TMPL_IF .allow.create_image>
 <script src="js/image_upload.js" type="text/javascript"></script>
 </TMPL_IF>
@@ -28,11 +30,13 @@
                         }
                     </TMPL_IF>
 
+                    //TODO: add confirm handler
                     $('#imageList').show();
                 }
             });
             // get initially selected tab
-            selectedImageTab=getSelectedTab('image-tabs');
+            selectedImageTab = getSelectedTab('image-tabs');
+            pageLeaveHandler();
         }
     );
 </script>