function pv(n)
	{
		if(n==1){
			listgroup1.style.display="block";
			listgroup2.style.display="none";
			listgroup3.style.display="none";
		}
		if(n==2){
			listgroup1.style.display="none";
			listgroup2.style.display="block";
			listgroup3.style.display="none";
		}
		if(n==3){
			listgroup1.style.display="none";
			listgroup2.style.display="none";
			listgroup3.style.display="block";
		}
	}