var w = window;
function openWin(urlname,fname,wwidth,wheight) {
	LeftPosition = (screen.width) ? (screen.width - wwidth)/2 : 0;
	TopPosition = (screen.height) ? (screen.height - wheight)/2 : 0;
	w = open(urlname,fname,"width="+wwidth+",height="+wheight+",top="+TopPosition+",left="+LeftPosition+",scrollbars=yes");
	w.focus();
}