function show_activObj(_id){
	var doIt = false;
	if(typeof(_activObj) != "undefined"){
		if(typeof(document.getElementById(_activObj)) != "undefined"){
			document.getElementById(_activObj).style.display = "none";
		}
	}
	if(typeof(_activObj) == "undefined" ){ doIt = true; }
	else if(_activObj != _id){doIt = true;}
	if(typeof(document.getElementById(_id)) != "undefined" && doIt){
		document.getElementById(_id).style.display = "block";
		_activObj = _id;
	}
}