Unwanted Javascript window when opening fullscreen

Hi all...
I'm calling a javascript function (from html)to open a fullscreen window. This works fine, but leaves me with a new window in addition to the fullscreen one. Oddly enough, it's title is the javascript function (javascript:{window.open("main.html","",fullscreen =yes")}. Why is this happening?? I've tried to close the window after it has been opened by using window.close and entering the above function in the window name parrameter - but it just wont go away!
I'm a javascript novice, so it's probably something really stupid that i've done wrong.
Please help!!