var name = "#floatMenu";   
var menuYloc = null;   
  
$(document).ready(function(){   
    menuYloc = parseInt($(name).css("top").substring(0,$(name).css("top").indexOf("px")))   
    $(window).scroll(function () {    
        var offset = menuYloc+$(document).scrollTop()+"px";   
        $(name).animate({top:offset},{duration:500,queue:false});   
    });   
});