function size_screen() {
	window.moveTo(0,0);
	window.resizeTo(screen.availWidth,screen.availHeight);
}
	
function popup(address,winurl,winwidth,winheight) {
        var new_window = window.open(address,winurl,'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=0,width=' + winwidth + ',height=' + winheight);
}