Stop running this script? A script on this page is causing your browser to run slowly...

...If it continues to run, your computer might become unresponsive.

From a client perspective this may be prevented by doing the following:

·         Open Internet Explorer.

·         On the Tools menu, click Internet Options.

·         In the Internet Options dialog box, click Advanced.

·         Click to select the Disable script debugging check box.

·         Click to clear the Display a notification about every script error check box.

·         Click OK

For the intrepid techie, there is also a registry setting tweak you can attempt for overcoming this problem: See Miscorsoft support article here: http://support.microsoft.com/default.aspx?scid=kb;en-us;Q175500

From a developer perspective check out this blog entry: http://www.picnet.com.au/blogs/Guido/post/2010/03/04/How-to-prevent-Stop-running-this-script-message-in-browsers.aspx

A further option for developers is using the IE8 Developer Tools JScript Profiler. Look this up on the MSDN blog here:
http://blogs.msdn.com/b/ie/archive/2008/09/11/introducing-the-ie8-developer-tools-jscript-profiler.aspx