function menu(sender,obj) {


	if(document.getElementById(obj).style.display == "none")

    {
        document.getElementById(obj).style.display = "block";
        document.getElementById(sender).style.display = "none";

	}
    else{

        document.getElementById(obj).style.display = "none";
        document.getElementById(sender).style.display = "block";


	}
}