Einigermaßen supported geht es auch im OnLoad-Ereignis des entsprechenden Formulars:
window.moveTo(100,10);
if (document.all) {
top.window.resizeTo(900, 840);
} else {
if (document.layers || document.getElementById) {
if (top.window.outerHeight < screen.availHeight || top.window.outerWidth < screen.availWidth) {
top.window.outerHeight = screen.availHeight;
top.window.outerWidth = screen.availWidth;
}
}
}