function hide(id)
{
	var e           = document.getElementById(id);
    e.style.display = "none";
}

function set_class(id, class_value)
{
	var e = document.getElementById(id);
	e.className = class_value;
}

function show(id)
{
    var e           = document.getElementById(id);
    e.style.display = '';
}