Hello reader,
What I now have is (Im not sure), but probably not a flash issue.
But I really dont know were else to go, maybe you know something more about this “thingy”
But I made a tutorial (dutch) on how you can make flash popups, but today a friend told me it aint working on linux.
He made me a screenshot for me to show
http://img324.imageshack.us/img324/2051/geil36hy.png
As you can see hes on linux system, but in firefox or explorer on windows there is no problem at all as you can see here
http://vintage.sitemasters.be/tutorials/flashPopupTutorial/popup.htm
(without linux lol)
The swf should be transparent (which isnt on the screenshot)
So If anyone knows some more, plz let me know 
update: he just checked with explorer and linux, and no problem there, so its probably an FF bug or something…