Show spinner while Fetching data from server

Hi Faisal,
You can show the loading image right in the click event and use jquery's deferred method always() to hide the loading image. Here's a sample script:

$(document).ready(function() {
        $("#submit").click(function(){
            var acc = $("#accountNumber").val();
            src = "pass.php";
            //show your loading image
            $("#loading").show();
            $.ajax({
                url: src,
                data: 'action=account&type=viewDetail&accNo='+acc,
                cache: false,
                type:'GET',
                success: function(data, textStatus, XMLHttpRequest){
                    if(data!=0) {
                        $("#userInfo").html("");                        
                        $("#userInfo").css("display","block");
                        $("#userInfo").append(data);
                    }else {
                        $("#userInfo").html('');                        
                        $("#userInfo").append('<span class="alert-red alert-icon">Please Enter correct Account Number.</span>');
                        $("#userInfo").css("display","block");
                    }
                },
                error:function(XMLHttpRequest, textStatus, errorThrown){alert(textStatus); alert(errorThrown);}
            //hide your loading image
            }).always(function(){
                $("#loading").hide();
            });  
        });
});

hi
You can use jquery loader

$('#element id').bind('click', function() {     
        $("<span><img src='loader image path' alt='Loading...' /></span>").insertAfter($(this));
        $(this).next().remove();
        $(this).unbind('click');
    });

you also find more details on
http://demos.mimiz.fr/jquery/loader

you can use

xmlhttp.onloadstart(){
    document.getElementById().style.display="block";
};
xmlhttp.onloadend(){
    //you can make it delay with 3 second by settimeout() function
    document.getElementById().style.display="none";
};

This works pretty well