var myWin;

function openWindow(windowName, pageUrl, width, height) {
	if (myWin) {
		myWin.close();
	}
	myWin = window.open(
		pageUrl,
		windowName,
		'alwaysRaised=yes,height=' + height + ',location=no,menubar=no,resizable=yes,status=no,toolbar=no,width=' + width
	);
}