// opens a dialog with help info in it:
function openHelp(url)
{
	var width = 550;
	var height = 400;
	var left = (screen.availWidth - width) / 2;
	var top = (screen.availHeight - height) / 2;
	var helpWindow = window.open(url, "_new", "width=" + width + ",height=" + height + ",left=" + left + ",top=" + top + ",location=no,menubar=no,resizable=yes,scrollbars=yes,status=no,titlebar=yes,toolbar=no");
	helpWindow.resizeTo(width, height);
}