function $() {
	var elements = new Array();
	for (var i = 0; i < arguments.length; i++) {
		var element = arguments[i];
		if (typeof element == 'string')
			element = document.getElementById(element);
		if (arguments.length == 1)
			return element;
		elements.push(element);
	}
	return elements;
}


function Visivel(id) {
  var obj = null;
        obj = $(id);
        if (obj.style.visibility == "hidden") {
            obj.style.visibility = "visible";
        } else {
            obj.style.visibility = "hidden";
        }

}