--- a/genajax.js	Tue Jan 24 18:01:13 2017 +0200
+++ b/genajax.js	Tue Jan 24 23:22:02 2017 +0200
@@ -7,6 +7,24 @@
 var jsUploadCBS = [];
 
 
+function jsAddEventListener(velem, vev, vfunc)
+{
+  if (velem)
+  {
+    if (velem.attachEvent)
+       return velem.attachEvent('on'+ vev, vfunc);
+     else
+       return velem.addEventListener(vev, vfunc, false);
+  }
+}
+
+
+function jsAddEventListenerById(velem, vev, vfunc)
+{
+  jsAddEventListener(document.getElementById(velem), vev, vfunc);
+}
+
+
 function jsHandleMessageBoxKeys(ev)
 {
   ev = ev || window.event;
@@ -61,8 +79,7 @@
     document.onkeydown = jsHandleMessageBoxKeys;
     jsSetMessageBoxCBs(null, null, null);
 
-    var elem = document.getElementById("msgBoxConfirmClose");
-    elem.onclick = function () { jsCloseMessageBox(0, 0); }
+    jsAddEventListenerById("msgBoxConfirmClose", "click", function () { jsCloseMessageBox(0, 0); });
 
     nitem.style.display = "block";
   }
@@ -95,12 +112,9 @@
     document.onkeydown = jsHandleMessageBoxKeys;
     jsSetMessageBoxCBs(cb_ok, cb_cancel, cb_data);
 
-    var elem = document.getElementById("msgBoxConfirmCancel");
-    elem.onclick = function () { jsCloseMessageBox(cb_cancel, cb_data); }
+    jsAddEventListenerById("msgBoxConfirmCancel", "click", function () { jsCloseMessageBox(cb_cancel, cb_data); });
+    jsAddEventListenerById("msgBoxConfirmOK", "click", function () { jsCloseMessageBox(cb_ok, cb_data); });
 
-    elem = document.getElementById("msgBoxConfirmOK");
-    elem.onclick = function () { jsCloseMessageBox(cb_ok, cb_data); }
-    
     nitem.style.display = "block";
   }
 }
@@ -253,11 +267,9 @@
       "<img src='"+file+"' alt='"+file+"' />"+
       "</div>";
 
-    var elem = document.getElementById("messageBox");
-    elem.onclick = function () { jsCloseMessageBox(0, 0); }
+    jsAddEventListenerById("messageBox", "click", function () { jsCloseMessageBox(0, 0); });
 
     nitem.style.display = "block";
-
     return false;
   }
 
@@ -309,10 +321,12 @@
         jsStatusMsg("Upload ["+filename+"] finished ...");
     }
   }, false);
+
   req.addEventListener("error", function(e)
   {
     jsErrorMessageBox("Error occured while uploading "+filename);
   }, false);
+
   req.addEventListener("abort", function(e)
   {
     jsStatusMsg("Upload of '"+filename+"' aborted.");