function ChgA(titid){
	document.getElementById("tita").className="entxt selb";
	document.getElementById("cona").style.display="none";
	document.getElementById("titb").className="entxt selb";
	document.getElementById("conb").style.display="none";
	document.getElementById("titc").className="entxt selb";
	document.getElementById("conc").style.display="none";	
	document.getElementById("tit"+titid).className="entxt sela";
	document.getElementById("con"+titid).style.display="block";
}