If you recieve an illegal operation on a particular web site, it is usually due to a corrupted file. First, delete your browser cache.
In Netscape, go to Edit, Preferences, on the left to Advanced, then Cache. On the right, click to clear both the Memory and Disk cache.
If you use Internet Explorer go to Tools, Internet Options, and under General tab, click Delete Files under Temporary Internet Files.
Click OK, then close your browser, open it again and go to the web page again.
It is also possible the page is trying to load a plug-in for the web site to view some information. The page will usually have what plug-in it's trying to use. Try going to the plug-in's web site and reinstall the software then try the page again.