The bad boys I run into are McAfee, Google Desktop, Norton and others will interfere with sites that want to open a new window.
First, I'm not a Windows user so please forgive my ignorance.
I know the URLs are good because if he enters the URL directly without using the JS link to open a new window, the page opens correctly in IE. In Firefox it opens the page, but shows a previous version that has since been updated. He says he has cleared the cache in IE, but cannot figure out how to do it in Firefox.
I know the JS is good because it works on other Windows and Mac machines.
As far as I can tell, he does not have JS disabled, since other similar pages work for him.
Any ideas or suggestions on how to troubleshoot this problem?