visiblePopupId = null; 

$(document).ready( function()
{  
    var popups = $(".popup");
    popups.parent().children(".popup").remove();
    $("body").append(popups);
    
    // Uždarymo mygtukas
    $(".popupClose").click(function()
    {  
        disablePopup(); 
    });  
    
    // Paspaudus ant fono uždaro
    $("#popupBackground").click(function()
    {  
        disablePopup();  
    }); 
     
    // Paspaudus ESC uždaro 
    $(document).keypress(function(e)
    {  
        if (e.keyCode == 27 && visiblePopupId != null)
        {  
            disablePopup();  
        }
    });
    
    // If window was resized, calculate the new overlay dimensions
    $(window).resize(function() 
    {
        if (visiblePopupId != null)
        {
            // Get page sizes
            var arrPageSizes = getPageSize();
            var popupHeight  = $("#" + visiblePopupId).height();  
            var popupWidth   = $("#" + visiblePopupId).width();  

            // Style overlay and show it
            $('#popupBackground').css({
                width:		arrPageSizes[0],
                height:		arrPageSizes[1]
            });

            // Calculate top and left offset for the jquery-lightbox div object and show it
            $("#" + visiblePopupId).css({
                top:	arrPageSizes[3] / 2 - popupHeight / 2, 
                left:	arrPageSizes[2] / 2 - popupWidth / 2 
            });  
        }
    });
});
 
function loadPopup(id)
{ 
    if (visiblePopupId == null)
    {  
        visiblePopupId = id;
        
        centerPopup();
        
        // Fade in
        $("#popupBackground").css({  
            "opacity": "0.7"  
        });  
        $("#popupBackground").fadeIn("slow");  
        $("#" + id).fadeIn("slow");  
    }  
}  


function disablePopup()
{  
    if(visiblePopupId != null)
    {  
        // Fade out
        $("#popupBackground").fadeOut("slow");  
        $("#" + visiblePopupId).fadeOut("slow");  
        
        visiblePopupId = null;  
    }  
} 


function centerPopup()
{  
    // Get page sizes
    var arrPageSizes = getPageSize();
    var popupHeight  = $("#" + visiblePopupId).height();  
    var popupWidth   = $("#" + visiblePopupId).width();  

    // Style overlay and show it
    $('#popupBackground').css({
        width:		arrPageSizes[0],
        height:		arrPageSizes[1]
    });
    
    // Calculate top and left offset for the jquery-lightbox div object and show it
    $("#" + visiblePopupId).css({
        top:	arrPageSizes[3] / 2 - popupHeight / 2, 
        left:	arrPageSizes[2] / 2 - popupWidth / 2 
    });  
}  

/**
 / THIRD FUNCTION
 * getPageSize() by quirksmode.com
 *
 * @return Array Return an array with page width, height and window width, height
 */
function getPageSize() {
    var xScroll, yScroll;
    if (window.innerHeight && window.scrollMaxY) {	
        xScroll = window.innerWidth + window.scrollMaxX;
        yScroll = window.innerHeight + window.scrollMaxY;
    } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
        xScroll = document.body.scrollWidth;
        yScroll = document.body.scrollHeight;
    } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
        xScroll = document.body.offsetWidth;
        yScroll = document.body.offsetHeight;
    }
    var windowWidth, windowHeight;
    if (self.innerHeight) {	// all except Explorer
        if(document.documentElement.clientWidth){
            windowWidth = document.documentElement.clientWidth; 
        } else {
            windowWidth = self.innerWidth;
        }
        windowHeight = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
        windowWidth = document.documentElement.clientWidth;
        windowHeight = document.documentElement.clientHeight;
    } else if (document.body) { // other Explorers
        windowWidth = document.body.clientWidth;
        windowHeight = document.body.clientHeight;
    }	
    // for small pages with total height less then height of the viewport
    if(yScroll < windowHeight){
        pageHeight = windowHeight;
    } else { 
        pageHeight = yScroll;
    }
    // for small pages with total width less then width of the viewport
    if(xScroll < windowWidth){	
        pageWidth = xScroll;		
    } else {
        pageWidth = windowWidth;
    }
    arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
    return arrayPageSize;
}

/**
 / THIRD FUNCTION
 * getPageScroll() by quirksmode.com
 *
 * @return Array Return an array with x,y page scroll values.
 */
function getPageScroll() {
    var xScroll, yScroll;
    if (self.pageYOffset) {
        yScroll = self.pageYOffset;
        xScroll = self.pageXOffset;
    } else if (document.documentElement && document.documentElement.scrollTop) {	 // Explorer 6 Strict
        yScroll = document.documentElement.scrollTop;
        xScroll = document.documentElement.scrollLeft;
    } else if (document.body) {// all other Explorers
        yScroll = document.body.scrollTop;
        xScroll = document.body.scrollLeft;	
    }
    arrayPageScroll = new Array(xScroll,yScroll);
    return arrayPageScroll;
}