function openWinCentered(mypage, myname, w, h, scroll, resize) {
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable='+resize;
	return window.open(mypage, myname, winprops)
}