function show(p,f) {
	var tmenu = document.getElementById("menu").getElementsByTagName("LI");

	for ( i = 0; i <= 8; i++ ) {
		tmenu[i].className = "off";
	}
	for ( j = 1; j <= 9; j++ ) {
		document.getElementById("c" + j).style.display = "none";
	}

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