var popupStatus = 0;  

function loadPopup()
{  
 //loads popup only if it is disabled  
	if (popupStatus == 0) 
	{  
		//$("#backgroundPopup").css({  "opacity": "0.7"  });  
		//$("#backgroundPopup").fadeIn("slow");  
		jQuery("#popupGroupInfo").fadeIn("slow");  
		popupStatus = 1;  
	}  
 }

 function disablePopup()
 {  
	 //disables popup only if it is enabled  
	 if(popupStatus==1)
	 {  
		jQuery("#backgroundPopup").fadeOut("slow");  
		jQuery("#popupGroupInfo").fadeOut("slow");  
		popupStatus = 0;  
	 }  
 } 

 function centerPopup()
 {  
 //request data for centering  
 var windowWidth = document.documentElement.clientWidth;  
 var windowHeight = document.documentElement.clientHeight;  
 var popupHeight = jQuery("#popupGroupInfo").height();  
 var popupWidth = jQuery("#popupGroupInfo").width();  
 //centering  
 jQuery("#popupGroupInfo").css({  
 "position": "absolute",  
 "top": windowHeight/2-popupHeight/2,  
 "left": windowWidth/2-popupWidth/2  
 });
 }