function index_na(num)
	{
		var i,li=document.getElementById("news_indexa").getElementsByTagName("li");
		for(i=0;i<li.length;i++)
		{
			if(i==num)
			{
				li[i].className="n_3";
				document.getElementById("index_l_na"+i).className="block";
				document.getElementById("ca"+i).className="block";
			}
			else
			{
				li[i].className="n_4";
				document.getElementById("index_l_na"+i).className="none";
				document.getElementById("ca"+i).className="none";
			}
		}
	}