var name = "#floating_nav";
var menuYloc = null;
  
$(document).ready(function() {

	menuYloc = parseInt($(name).css("top").substring(0,$(name).css("top").indexOf("px")))
	$(window).scroll(function () { 
				offset = menuYloc+$(document).scrollTop()+"px";
				$(name).animate({top:offset},{duration:1000,queue:false});
	});

});