function portPop(offset) {
	var nTop, nLeft, h, w;
	w = 580;
	h = 450;
	nTop = (window.screen.height - h - 40) / 2; //40 Title and Status
	nLeft = (window.screen.width - w - 6) / 2;
	newWindow = window.open('PortPopUp.aspx?Offset=' + offset,'portPop',"top=" + nTop + ", left=" + nLeft + ", status=yes,resizable=yes,Height=" + h + ",Width=" + w)
	newWindow.focus();
	}