function detect(id){
	if ( document.getElementById ){
		target = document.getElementById(id);
		target.style.display = "none";	
	}
}

function ctrl(id){	
	if ( document.getElementById ){
		target = document.getElementById(id);		
		switch(target.style.display){
			case "none":
				target.style.display = "block";
				target.style.visibility = "visible";
				break;
			case "block":
				target.style.display = "none";
				target.style.visibility = "hidden";
				break;
			default:
				target.style.display = "none";
				target.style.visibility = "hidden";
				break;				
		}
	}
}