Javascript pop up works only on firefox nothing else

Hello smart group of ppl, just have a stupid problem. I have a portfolio online (yeh i know similar to 2advanced but i had no choice)…wat im doin is, i have a html splash page that u click on to go to my porfolio which is in a popup. im using javascript to call it, it works on firefox but no other browser. if anyone could visit my site and view my code on the splash page to see what it could be I’d appreciate it. thanks.