$(document).ready(function() {
    $("#menu_ul li").prepend("<span> </span>"); //Throws an empty span tag right before the a tag
    $("#menu_ul li").each(function() { //For each list item...
		  var linkText = $(this).find("a").html(); //Find the text inside of the a tag
      $(this).find("span").show().html(linkText); //Add the text in the span tag
      }); 
    $("#menu_ul li").hover(function() {	//On hover...
      $(this).find("span").stop().animate({ 
			  marginTop: "-40" //Find the span tag and move it up 40 pixels
      }, 250);
    } , function() { //On hover out...
      $(this).find("span").stop().animate({
			 marginTop: "0" //Move the span back to its original state (0px)
		  }, 250);
	   });
});