function overs(ids,idd,idds)
	{
		document.getElementById(ids).style.display="";
		document.getElementById(idd).className="qians";
		document.getElementById(idds).className="hous";
		switch(ids)
	   {
	   case "a2009":
		  document.getElementById("d2008").style.display="none";
		  document.getElementById("d2007").style.display="none";
		  document.getElementById("d2006").style.display="none";
		  document.getElementById("d2005").style.display="none";
		  document.getElementById("d1999").style.display="none";
		  document.getElementById("d1992").style.display="none";
		 break
	   case "a2008":
		  document.getElementById("d2007").style.display="none";
		  document.getElementById("d2006").style.display="none";
		  document.getElementById("d2005").style.display="none";
		  document.getElementById("d1999").style.display="none";
		  document.getElementById("d1992").style.display="none";
		 break
	   case "a2007":
		  document.getElementById("d2006").style.display="none";
		  document.getElementById("d2005").style.display="none";
		  document.getElementById("d1999").style.display="none";
		  document.getElementById("d1992").style.display="none";
		 break
	   case "a2006":
		  document.getElementById("d2005").style.display="none";
		  document.getElementById("d1999").style.display="none";
		  document.getElementById("d1992").style.display="none";
		 break
	   case "a2005":
		  document.getElementById("d1999").style.display="none";
		  document.getElementById("d1992").style.display="none";
		 break
	case "a1999":
		  document.getElementById("d1992").style.display="none";
		 break
	   default:
			document.getElementById("d1992").style.display="";
	   }

		
	}
	function outs(ids,idd,idds)
	{
		document.getElementById(ids).style.display="none";
		document.getElementById(idd).className="qian";
		document.getElementById(idds).className="hou";

		switch(ids)
	   {
	   case "a2009":
		  document.getElementById("d2008").style.display="";
		  document.getElementById("d2007").style.display="";
		  document.getElementById("d2006").style.display="";
		  document.getElementById("d2005").style.display="";
		  document.getElementById("d1999").style.display="";
		  document.getElementById("d1992").style.display="";
		 break
	   case "a2008":
		  document.getElementById("d2007").style.display="";
		  document.getElementById("d2006").style.display="";
		  document.getElementById("d2005").style.display="";
		  document.getElementById("d1999").style.display="";
		  document.getElementById("d1992").style.display="";
		 break
	   case "a2007":
		  document.getElementById("d2006").style.display="";
		  document.getElementById("d2005").style.display="";
		  document.getElementById("d1999").style.display="";
		  document.getElementById("d1992").style.display="";
		 break
	   case "a2006":
		  document.getElementById("d2005").style.display="";
		  document.getElementById("d1999").style.display="";
		  document.getElementById("d1992").style.display="";
		 break
	   case "a2005":
		  document.getElementById("d1999").style.display="";
		  document.getElementById("d1992").style.display="";
		 break
	case "a1999":
		  document.getElementById("d1992").style.display="";
		 break
	   default:
			document.getElementById("d1992").style.display="";
	   }
	}