function shadow(menuel)
{
clear();
if (menuel == news){menuel.src="pic/navig/news2.gif";}
if (menuel == teach){menuel.src="pic/navig/teach2.gif";}
if (menuel == info){menuel.src="pic/navig/info2.gif";}
}

function clear()
{
news.src="pic/navig/news1.gif";
teach.src="pic/navig/teach1.gif";
info.src="pic/navig/info1.gif";
}