function DisplayId( correct ){
	var url = location.href;
	var answer = (url.match(/\?/))? url.split("?")[1] : "";
	var result = ( answer == correct )? "ok" : "ng";
	var result2 = result + "_u";
	document.getElementById(result).style.display = "block";
	document.getElementById(result2).style.display = "block";
}