function hidechannels() {
if (document.getElementById("channels").ClassName == "hidden" ) {
document.getElementById("channels").ClassName = "visible";
} else {
document.getElementById("channels").ClassName = "hidden";
}
function hidechannels(id) {
var monobjet=document.getElementById(id);
if (monobjet.className == "hidden" ) {
monobjet.className = "visible";
}else {
monobjet.className = "hidden";
}
}