function windowPopUp(mylink, windowname)
{
	//Calculate center of screen.
	var width = 525;
	var height = 600;
    var left = parseInt((screen.availWidth/2) - (width/2));
    var top = parseInt((screen.availHeight/2) - (height/2));
	var windowFeatures = "width=" + width + ",height=" + height + ",status=1,scrollbars=1,resizable,left=" + left + ",top=" + top + "screenX=" + left + ",screenY=" + top;
	
	//window focus
	if (! window.focus)return true;
	
	//obtain hyperlink
	var href;
	if (typeof(mylink) == 'string')
   		href=mylink;
	else
   		href=mylink.href;
	
	//open new window	
	window.open(href, windowname, windowFeatures);
	
	return false;
}