Those are so ack Andy, I kno IMs, crap90s sites use em but theyr frowned upon imo, nothing worse than a frkin popup window.
hmm consider a lightbox or equivelent popup or if you must use a popup there are plenty of scripts on dynamicdrive - Dynamic Drive- Browser Window
Its not for a website its for an interactive piece thats going to be worked on using a local hard drive, just using a browser to operate it. I'd sooner shoot myself than put a pop up on a site. Its just to display information and links to the user when clicked upon