Help debugging window.event.screenX
<p>I'm using firebug and the latest FF to debug this bit of javascript.  When line #30 is hit in the debugger the screen tries to refresh with message</p>

<blockquote>
  <p>"To display this page, firefox must
  send information that will repeat any
  action (such as a search or order
  confirmation) that was performed
  earlier.</p>
</blockquote>

<p>Javascript with line #'s  <strong>Called via OnClick()</strong></p>

<pre><code>function EnterComment(divName, /*...couple other params*/) {
25
26 thatDiv = divName;
27 //...comment
28
29 // Mouse Position with offset
30 var x = window.event.screenX + 10;
31 var y = document.body.scrollTop + 20; 
</code></pre>

<p>This doesn't work in IE either.  Is there any way to get an exception from Firebug?  Any other tips to fix this?</p>
