Sure man, this is what I used on the site I worked on:
<script>
function maXimize()
{
window.moveTo(0,0)
window.resizeTo(screen.width,screen.height)
}
</script>
Actualy someone else posted this in a different forum question, I think it was "JennyM"...just call this function as an onload...the (0,0) just means what size the window should it maximize to, the 0,0 is full screen... I have not failed; I merely found 100,000 different ways of not succeding...