Firefox and netscape

Hey, everyone, I’m new here:gm: …I just want to ask some questions. I hope someone can help me.
I have a flash detection kit with three index.html
Index1.html, has the “flash_detection.swf”
index2.html the page warning of having a new version of flash.
index3.html has “mymovie.swf”.
The problem is on IE everything works fine, and the movie shows up in the size I put in. but in firefox and netscape the “mymovie” is too small it is the size of the flash_detection.swf that is “80x80”.
Any one knows if I have to put and extracode on the html for this.Or have any idea what’s going on?