function popup(mypage, myname, w, h)
{
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+', scrollbars=no, resizable=no, menubar=no, toolbar=no, status=no, location=no'
	win = window.open(mypage, myname, winprops)
	if (parseInt(navigator.appVersion) >= 4) 
	{ 
		win.window.focus(); 
	}
}