Center a New Window

function newWindow(sURL, sName, w, h) {
	//  your new window's width
	var w = w || 640;
	//  your new window's height
	var h = h || 480;
	var sName = sName || ("win" + new Date().getTime());
	
	var ah = window.screen.availHeight;
	var aw = window.screen.availWidth;
	var l = (aw/2) - (w/2);
	var t = (ah/2) - (h/2);
	var sAtts = "location=yes" + 
		",menubar=yes" + 
		",resizable=yes" + 
		",scrollbars=yes" + 
		",status=yes" + 
		",toolbar=yes" +
		",height=" + h + 
		",width=" + w + 
		",top=" + t + 
		",left=" + l;		
		
	window.newWin = window.open(sURL, sName, sAtts);
}