Hello Friends.
Can anybody tell me whats wrong in this code, its giving runtime error whenever i click the mainframe, rather than alert. Both mainFrame.htm and topmenu.htm are empty files


Code:
<html>
 <head>
  <title>
    Testing Co-Browsing
  </title>
  <script language="javascript">
  function ButtonClick()
  {
    alert("Hello");
  }
</script>

 </head>
 <frameset rows="15%,85%">
   <frame src="topmenu.htm" name="topmenu">
   <frame src="mainframe.htm" name="mainwindow" onClick="ButtonClick()">
 </frameset>
</html>

thanx
saddysan