function showsub_a(id)
	{	
		for (i = -2;i<=9;i++)
		{
		 if(document.getElementById("sub_a"+i))
		 {
			//document.getElementById("tab_a"+i).style.color = "#ffffff";
			document.getElementById("tab_a"+i).style.background = "url() no-repeat 0 0;";
			document.getElementById("tab_a"+i).style.fontWeight = "";
			document.getElementById("sub_a"+i).style.display = "none";
		 }
		}
		if(document.getElementById("sub_a"+id))
		{
			//document.getElementById("tab_a"+id).style.color = "#9F3909";
			document.getElementById("tab_a"+id).style.background = "url(img/bb.gif) no-repeat 0 0;";
			document.getElementById("tab_a"+id).style.fontWeight = "bolder";
			document.getElementById("sub_a"+id).style.display = "";
		}
	}