Help! how to make a popup window work!

I have a popuped Html window, and it contains a flash file. I want to know how can I make it work if the PC doesnot install the flash player yet. So what kind of code should I add on my file to make it download the player?:phil:

Hmm … Windows usually does that automatically. I have no idea for Mac though :-\

Thanks, and I will try and come back later if i got more problem.