slidedown jquery problem
<pre>
function show_destination(country_id,airport_id){
    $.ajax({
        type: "POST",
        url: "function.php",
        data: "country_id="+country_id+"&airport_id="+airport_id+"&action=destination",
         beforeSend: function() { $("#loader_destination").html(''); },
        success: function(msg){
            // $(".loader_destination").empty();    
            //$("#destination_div").html(msg);
            //$("#destination_div").slideDown("slow",function(){$("#destination_div").html(msg);})  
            //$("#destination_div").html(msg,function(){$("#destination_div").slideDown("slow");});
            $('#destination_div').slideDown(500, function() { $('#destination_div').html(msg);});

           }
 });

}
</pre>

<p>slideDown this effect not working , 
output simply display , am not find any  effect on display output, </p>
