function up_down(img,body)
{
		if(img.src.indexOf("up") > -1)
		{
			img.src="menu/arrow_down.gif";
			document.getElementById(body).style.display = "none";
		}
		else
		{
			img.src="menu/arrow_up.gif";
			document.getElementById(body).style.display = "block";
		}
};