http://putfly.com/show.aspx?id=352&cid=37
<SCRIPT LANGUAGE="JavaScript">
<!--
function maximizeWin() {
if (window.screen) {
var aw = screen.availWidth;
var ah = screen.availHeight;
window.moveTo(0, 0);
window.resizeTo(aw, ah);
}
}
// -->
</SCRIPT>
<FORM><INPUT TYPE="button" VALUE="Maximize" onClick="maximizeWin()"></FORM>