function fmenu(arg) {
if (arg.style.visibility=="hidden") {
arg.style.visibility="visible";
}
else{
arg.style.visibility="hidden";
}
}

function fContraste(arg) {
//alert(arg);
arg.className="botonContraste"
}

function fNormal(arg){
//alert(arg);
arg.className="botonNormal";
}