var helpWindow;

function openHelpWindow(url)  {
	var windowHeight = 450;
	var windowWidth = 450;
	var name = "helpWindow";
	var options = "scrollbars=yes,dependent=yes,menubar=no,resizable=yes,toolbar=no,width=" + windowWidth + ",height=" + windowHeight + " ";
	helpWindow = window.open(url, name, options);
}

function closeHelpWindow()  {
	if ( helpWindow != null )  {
		helpWindow.close();
	}
}