IE6+ error: "A script on this page is causing Internet Explorer to run slowly..."

IE6+ error: "A script on this page is causing Internet Explorer to run slowly..."

Hi There,

I'm developing a UI for an online app and I'm having some troubles with IE and the "do you wish to abort this script" popup.

URL: http://staging.legalbenchmarking.com.au/site-login/
***Had to remove login details for security.
Found the solution to this, if anyone wants code samples let me know.

The problematic page is the personel-questionare. To get there, select personel-questionare from the main menu, or navigate to http://staging.legalbenchmarking.com.au/benchmarking/personnelq/ once you have logged in.

The javascript plugin which controls the UI for this page is here:
http://staging.legalbenchmarking.com.au/scripts/jquery/benchmarking.app.js

This form is also using the jquery validate plugin, with some custom methods.

The alert appears in IE6+ when you click on the main navigation or the next ot previous buttons.
This causes a hidden field to be set via a jquery click handler for these elements, and the form to be submitted.

The form submits correctly inspite of these errors, but the client is not happy with this, and wants full functionality in IE8 at minimum.

I've been trying to debug this problem for 3 hours now, and I'm getting nowhere so any suggestions or help would be greatly appreciated.