display loading image on button click

Question

i am trying to get a loading image on button click of login page.

and jQuery code as

 $('#login').click(function () {
            $.blockUI({
                message: '<img src="~/Images/loading.gif" /> <h4>Loading .......</h4>',
                timeout: 4000
            });
        });

i am getting text message but not the image.. please help me.. and i want this image to load on button click success..

thank you..