var popupStatus = 0; 

function loadPopup(loadingPopup)
{   
	//loads popup only if it is disabled   
	if(popupStatus==0)
	{   
		$("#loadingBackground").css({   "opacity": "0.8"  });   
		$("#loadingBackground").fadeIn("slow");  
		$("#"+loadingPopup).fadeIn("slow");   
		popupStatus = 1;   
	}   
}  

function disablePopup(loadingPopup)
{   
	//disables popup only if it is enabled   
	if(popupStatus==1)
	{   
		$("#loadingBackground").fadeOut("slow");   
		$("#"+loadingPopup).fadeOut("slow");   
		popupStatus = 0;   
	}   
}  

function centerPopup(loadingPopup)
{   
	var windowWidth = document.documentElement.clientWidth;   
	var windowHeight = document.documentElement.clientHeight;   
	var popupHeight = $("#"+loadingPopup).height();   
	var popupWidth = $("#"+loadingPopup).width();   
	
	$("#"+loadingPopup).css({
		"position": "absolute",
		"top":windowHeight/2-popupHeight/2,
		"left": windowWidth/2-popupWidth/2
	});
	
	$("#loadingBackground").css({   "height": windowHeight   }); 
}

function centerAttachmentPopup(loadingPopup){
	var windowWidth = document.documentElement.clientWidth;   
	var windowHeight = document.documentElement.scrollHeight;   
	var popupHeight = $("#"+loadingPopup).height();   
	var popupWidth = $("#"+loadingPopup).width();   
	
	$("#"+loadingPopup).css({
		"position": "absolute",
		"top":windowHeight/2+popupHeight+150,
		"left": windowWidth/2-popupWidth/2
	});
	$("#loadingBackground").css({"height": windowHeight}); 
}