function show(p,f) {
	var tmenu = document.getElementById("menu").getElementsByTagName("LI");
	for ( j = 1; j <= 11; j++ ) {
		tmenu[j-1].className = "off";
		document.getElementById("c" + j).style.display = "none";
	}

  document.getElementById(p).style.display = "block";
	f.parentNode.className = "on";
	return false;
}