var newWindow = null;

function openWindow(contentURL,windowName,windowWidth,windowHeight,scrollBar) {
	widthHeight = 'height=' + windowHeight + ',width=' + windowWidth + ',scrollbars=' + scrollBar + ',resizable=yes,top=20,left=20';

	newWindow = window.open(contentURL,windowName,widthHeight);

	newWindow.focus()
}

function closeWindow() {
	if (newWindow != null) {
		newWindow.close();
		newWindow = null;
	}
}