function cptopleftkey(j) {
	for (var i = 1; i < 5; i++) {
		document.getElementById("channelcp"+i).style.backgroundPosition = "-219px 0";
                document.getElementById("channelcp"+i).style.color = "#cccccc";
		document.getElementById("menucontent"+i).style.display = "none";
	}
	document.getElementById("channelcp"+j).style.backgroundPosition = "0 0";
	document.getElementById("menucontent"+j).style.display = "block";
        document.getElementById("channelcp"+j).style.color = "#ff0000";
}