$(document).ready(function() {
    $(document).pngFix();
    	$("#header ul.main_menu li").each(function(index,elm){
            if($(this).hasClass('active'))
                return;
            $(elm).prepend("<span></span>"); //Throws an empty span tag right before the a tag
        });
	$("#header ul.main_menu 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
	});

	$("#header ul.main_menu li").hover(function() {	//On hover...
            if($(this).hasClass('active'))
                return;
            $(this).find("span").stop().animate({
                    marginTop: "-40" //Find the <span> tag and move it up 40 pixels
            }, 400);
	} , function() { //On hover out...
            if($(this).hasClass('active'))
                return;
            $(this).find("span").stop().animate({
                    marginTop: "0"  //Move the <span> back to its original state (0px)
            }, 400);
	});
});