forwarding problems - my little brain can't cope

Hi everybody :D

not sure whether I am posting this in the right forum here - but I'm really out of my depth on this one, not exactly a scripting genius... ;'(
Well, here's the story:
Site set up:
• index.html = main window, containing java script for pop up in head tag and flash file which triggers off the pop up window for site
• new.html = site window to pop up chromless, centered with flash site

Site upload:
• website was on my webspace for testing – no problems with the script, everything working perfectly (main window opens, opening pop up with site as intended)
• name “www.redhed.tv” was bought from a company called “.tv”
• final site was uploaded onto ISP’s webspace
• forwarding set up on .tv’s website to the freeserve space

Now the problem is that on certain machines, the main window opens up, displaying the graphic very quickly, then it disappears – saying page cannot be displayed...?!? Even though accessing it directly, ie URL of freeserve spae, works fine.
There had been a banner put on the site by the .tv company which the band now paid for to be removed – I’d thought that it was that causing the problem, maybe frames or something which they said they didn’t use for the banner. But now the banner is removed, same problem still there – it seems to be PCs, Windows 98 that have the problem....

Here are both link:
• http://www.redhed.tv >> the problematic link
• http://www.darkchile.freeserve.co.uk >> direct link to webspace

If anyone can spare me the time... please!!! Don't even know where to start.. :( :confused:
A friend of mine suggested that I should change the DNS settings (which I hardly know anything about)..?!?! Could that be the solution?

Thanks for listening... hoping for a light at the and of the tunnel ;)

forwarding problems - my little brain can't cope - please help!!!