//Anonymous function that is applied to all internal-links
var jump=function(e)
{
       //prevent the "normal" behaviour which would be a "hard" jump
       e.preventDefault();
       //Get the target
       var target = $(this).attr("href");
       //perform animated scrolling
       $('html,body').animate({scrollTop: 0},1000,function() {
           //attach the hash (#jumptarget) to the pageurl
           location.hash = target;
       });

}

$(document).ready(function()
{
       $('a[href$=#top]').bind("click", jump);
       return false;
});