Repeating alert "Message from web page: null" in IE
<p>I'm using the jQuery code below to launch an overlay div and it works great in Chrome and Firefox -- but in IE9 it launches a window "Do you want to leave this page?" and also says "message from web page: null". The window continues to come up on every single link clicked on after that until you end the session by logging out (it's a Codeigniter based app)</p>

<p>Any insight as to what may be causing this would be much appreciated.</p>

<p>EDIT: Offending code is:</p>

<p>window.onbeforeunload = function() { saveFormData(); return false; }</p>
