--- a/ajax.js	Wed Nov 26 10:02:41 2014 +0200
+++ b/ajax.js	Wed Nov 26 10:29:40 2014 +0200
@@ -3,17 +3,39 @@
 // Common JavaScript / AJAX code
 // (C) Copyright 2012-2014 Tecnic Software productions (TNSP)
 //
+var jsMessageBoxCancelCB = null, jsMessageBoxCBData = null, jsMessageBoxOKCB = null;
+
+function jsHandleMessageBoxKeys(ev)
+{
+  ev = ev || window.event;
+  var key = ev.keyCode ? ev.keyCode : ev.which;
+  if (key == 27)
+  {
+    jsCloseMessageBox(jsMessageBoxCancelCB, jsMessageBoxCBData);
+    return false;
+  }
+  else
+    return true;
+}
 
 
 function jsCloseMessageBox(callback, cb_data)
 {
   var nitem = document.getElementById("messageBox");
-  if (nitem && nitem.style.display != "none")
+  if (nitem)
   {
-    nitem.style.display = "none";
-  
-    if (callback && typeof(callback) === "function")
-      callback(cb_data);
+    document.onkeydown = null;
+    jsMessageBoxCancelCB = null;
+    jsMessageBoxCBData = null;
+    jsMessageBoxOKCB = null;
+
+    if (nitem.style.display != "none")
+    {
+      nitem.style.display = "none";
+
+      if (callback && typeof(callback) === "function")
+        callback(cb_data);
+    }
   }
 }
 
@@ -28,6 +50,11 @@
       "<input id='msgBoxConfirmClose' type='button' value=' OK '>"+
       "</div></div>";
 
+    document.onkeydown = jsHandleMessageBoxKeys;
+    jsMessageBoxCancelCB = null;
+    jsMessageBoxCBData = null;
+    jsMessageBoxOKCB = null;
+
     var elem = document.getElementById("msgBoxConfirmClose");
     elem.onclick = function () { jsCloseMessageBox(0, 0); }
 
@@ -53,6 +80,11 @@
       "<input id='msgBoxConfirmOK' type='button' value=' OK '>"+
       "</div></div>";
 
+    document.onkeydown = jsHandleMessageBoxKeys;
+    jsMessageBoxOKCB = cb_ok;
+    jsMessageBoxCancelCB = cb_cancel;
+    jsMessageBoxCBData = cb_data;
+
     var elem = document.getElementById("msgBoxConfirmCancel");
     elem.onclick = function () { jsCloseMessageBox(cb_cancel, cb_data); }