$(document).ready(function()
{
	//slides the element with class "menu_body" when paragraph with class "menu_head" is clicked 
	$("#menu p.menu_head").click(function()
    {
		$(this).css({backgroundPosition:"bottom"}).next("div.menu_body").slideToggle(300).siblings("div.menu_body").slideUp("slow");
       	$(this).siblings().css({backgroundPosition:"top"});
	});
	
});