Flash intro,help

Ok i have one flash video that i made,and i was wondering can i somehow put it on forum and make it to go everytime when someone open my forum,and would be nice if i could make it to go fullscreen or at least on big part of screen.Thank you!

Well, where are you wanting to place the video? In a post; in your homepage message; in a widget (module)?

well is set up by default for portal to be main page,so i guess on portal.Like dunno if you can understand me.You see video and then video dissapears and you see portal.

Do you mean a video on the portal or before the portal. If you are talking about before, then I have no idea how you would be able to do that.
If you are wanting the video on your portal, just make a new widget (module) holding your video.

I know for widgets and yes i think before forum appears.