function ShowLoading() {     
       
        //Get the screen height and width   
        var maskHeight = $(document).height();   
        var maskWidth = $(window).width();   
       
       //Set height and width to mask to fill up the whole screen   
        $('#mask').css({'width':maskWidth,'height':maskHeight});   
           
        //transition effect
        $('#mask').show();
       // $('#mask').fadeTo("slow",0.8);
        //$('#mask').show();
        //Get the window height and width   
        var winH = $(window).height();   
        var winW = $(window).width();   
                 
        //Set the popup window to center
        $('#dialog').css('top', winH / 2 - $('#dialog').height() / 2);
        $('#dialog').css('left', winW / 2 - $('#dialog').width() / 2);   
       
        //transition effect
       //  $('#dialog').fadeIn(20);
        $('#dialog').show();
    }

    function StopLoading() {
      //  alert('hide');
        $('#dialog').hide();
        $('#mask').hide();
    }