[Javascript] popup video window

[javascript@xxxxxxxxxx (javascript@xxxxxxxxxx)]

I'm reasonably new to javascript and have been wrestling with the following 
problem, unfortunately, it seems I'm the one being pinned.

I'm trying to create a popup window to display video. The problem is I need 
to create this popup from a thumbnail image that contains the filename of the 
video. 

But before displaying the video, I need the same popup window to display a 
choice where the user selects whether to use the quicktime or real player. I 
can't seem to figure out how to pass this variable.

I'm sure  this is something simple and it's a matter of my being stupid. But 
I'd really appreciate any help I can get.

Thanks in advance,

-Bob