Normally, if the command uses an argument you have to use the syntax "command=argument" like in this post:
http://www.eq2interface.com/forums/s...cript+commands
So for you that would be OnPress="browser=http://eq2interface.com"
If there's more than one command you need to put them in twice, but I think for one command just once is ok.
Oh, one other thing. If you could, it would be nice if the minimize button stored the original window size and then put that back when you clicked on it to restore. I added that when I put it into my browser window.