Likewise noticed it, but it wasn't a problem on my end... I assume you're not running Windows XP or you'd have a built in Pop-Up Stopper, so here's a link for one that'll do the same thing on Windows 98 and 2000.
http://www.panicware.com/product_psfree.html It will prevent other windows you want to open from opening at times, but that's easily overidden by holding the Ctrl key down when you click to open the other window, or shutting Pop-Up Stopper down temporarily if you're in an environment where you'll have numerous pop-up windows you want to open.
The one on the left there is a freebie, there's no time limit on it, it runs forever without quitting on you. I've run it for years and never had a moments trouble out of it.