$(document).ready(function() {
        $('#slide').hide();
        $('#slide').fadeIn(1500);

        //Might have to add a class to the 1,2,3 links to identify them.  In this case I assumed you added class='links' to each anchor tag.
        $(".links").click(function(e){
            
            //Stop it from going to the new url.
            e.preventDefault();
            
            //Get the links href value.
            var url = $(this).attr('href');
           
            $('#slide').fadeOut(500, function(){

                  //After fading out go to new location    
        window.location.href = url;

            });

            
        });

 });