The at the weekend issue had nothing to do with whether you have java installed or not.
If your browser, Firefox, IE or anything else, was equipped to deal with the ad causing the irritating redirect, when you wouldn't have had the issue.
The offending ad seems to have been removed so not sure why you are getting the problem, if it is the same one.
Nor will running a virus or malware scan help, unless the offending item has already installed unwanted software on your computer. My antivirus stopped the download anyway, The irritation was that navigating around the website became impossible.