var newWin = null;
function showWin (url, name, w, h) {
	leftPos = 0;
	topPos = 0;
	if (screen) {
		leftPos = (screen.width / 2) - 483;
		topPos = (screen.height / 2) - 350;
	}
	if (newWin != null && !newWin.closed) {
				newWin.focus();
	} else {
		var params="width="+w+",height="+h+",location=no,menubar=no,personalbar=no,scrollbars=no,toolbar=no,directories=no,resizable=no,status=no,left=" + leftPos + ",top=" + topPos;
		newWin = window.open (url, name, params);
		newWin.focus();
	}
}