//SETTING UP OUR POPUP  
//0 means disabled; 1 means enabled;  
var popupStatus = 0;

//loading popup with jQuery magic!  
function loadPopup(){  
	//loads popup only if it is disabled  
	if(popupStatus==0){  
		$("#backgroundPopup").css({  
		"opacity": "0.7"  
		});  
		$("#backgroundPopup").fadeIn("slow");  
		$("#popup").fadeIn("slow");  
		popupStatus = 1;  
	}  
}
 
//disabling popup with jQuery magic!  
function disablePopup(){  
	//disables popup only if it is enabled  
	if(popupStatus==1){  
		$("#backgroundPopup").fadeOut("slow");  
		$("#popup").fadeOut("slow");  
		popupStatus = 0;  
	}  
}

//centering popup  
function centerPopup(){  
	//request data for centering  
	var windowWidth = document.documentElement.clientWidth;  
	var windowHeight = document.documentElement.clientHeight;  
	var popupHeight = $("#popup").height();  
	var popupWidth = $("#popup").width();
	
	var top = windowHeight/2-popupHeight/2;
	var left = windowWidth/2-popupWidth/2;
	
	//centering  
	$("#popup").css({  
	"position": "absolute",  
	"top": top,  
	"left": left  
	});  
	//only need force for IE6    
	$("#backgroundPopup").css({  
	"height": windowHeight  
	});  	  
}

function showPopup(){
	loadPopup();
	centerPopup();
}