var InternetExplorer = navigator.appName.indexOf("Microsoft") != -1;

function openCenteredWindow(url, height, width, name, parms) {
	var left = Math.floor( (screen.width - width) / 2);
	var top = Math.floor( (screen.height - height) / 2);
	var winParms = "top=" + top + ",left=" + left + ",height=" + height + ",width=" + width;
	if (parms) { winParms += "," + parms; }
	var win = window.open(url, name, winParms);
	if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
	// return win;
}