var nprev,ntagprev;
function nshow(obj){
	if(nprev==null){nprev=document.getElementById("ncon1");}
	nprev.style.display="none";
	document.getElementById("ncon"+obj).style.display="block";
	nprev=document.getElementById("ncon"+obj);
	if(ntagprev==null){ntagprev=document.getElementById("ntag1");}
	ntagprev.className="";


}