function browserAlert()
{
        var id = "#browser_alert";
        //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').fadeIn(1000);      
        $('#mask').fadeTo("slow",0.8);    
      
        //Get the window height and width  
        var winH = $(window).height();  
        var winW = $(window).width();  
                
        //Set the popup window to center  
        $(id).css('top',  winH/2-$(id).height()/2);  
        $(id).css('left', winW/2-$(id).width()/2);  
      
        //transition effect  
        $(id).fadeIn(2000);   
}