Finding a bad script on website

Hope someone can help with this because I am at my wits end.

Heres the basic info and what is happening:

It only pops up a message box when you click a link to go to another page within the site or when you click the home link to return to the main page.

The message is something like this: A script on this page is causing IE to run slowly if it continues to run your computor might become unresponsive. Stop running this script? Yes or No

I have no idea whats causing it and hoping someone can help diagnose or tell me how to find the prob script.

It is happening on both websites, I have removed anything on main pages of both that are the same on both sites so I dont know what it is.

 

It may be caused by too many scripts on the site for your computer (and browser) to process, or at least one script that is too complex to process. I would start by removing everything, or make a new one and add the scripts one by one, probably in order of importance, until it gives the error. Then take that script back out, and keep going, until you keep getting the error, which means too many scripts.

Or, you can take out the least important scripts until it solves the problem, then try adding scripts that don't cause the problem again.