Javascript SymWinOpen function pain

This one really bugged me. I was trying to validate some code I had uploaded to a staging area on a site and it would not validate back on my PC running CSE HTML Validate because something somewhere was inserting extra bits of javascript, SymWinOpen, and I could not work out what was happening. I was getting the same added script in Firefox, IE and CSE HTML Validator (and this extra code was stopping my pages from validating) until I opened the same page up in Safari on my Mac and it didn't have the extra code... I eventually found that it was Norton Anti Virus 'adjusting' the pages for me as they came in on my PC. I probably should be grateful that its doing its job but you can turn it off: This is the code: followed by: Hopefully this will prevent hair loss as people try to figure out where this extra code is coming from! Update! Just discovered that the link I had to the Symantec page with information no longer resolves.