var i=1;
	var hd;
	function setDisplayPic()
	{
	   i=1;
	   hd=setInterval("pic()",3000);
	}
	function pic()
	{
	  switch_pic("img"+i);
	}
	function clearDisplayPic()
	{
	  clearInterval(hd);
	}
	setDisplayPic();
  function switch_pic(img)
  {
     try{
	 document.getElementById("display_img").src=document.getElementById(img).src;
	 document.getElementById("display_title").innerHTML=document.getElementById(img).title;
	 document.getElementById("display_href").href=document.getElementById(img+"_href").value;
	 }catch(ex){}
	 i++;
	 if(i>4) i=1;
  }	
  
  function changeNav(obj)
	{
		var p = obj.parentNode.parentNode.id;
		var plist = obj.parentNode.getElementsByTagName("h1");
		var subnav = p+"sub";
		var Nav = document.getElementById(subnav).getElementsByTagName("span");

		for(i=0;i<plist.length;i++)
		{
			if(obj == plist[i])
			{
				plist[i].className = "bg";
				Nav[i].className = "dis";
			}
			else
			{
				plist[i].className = "";
				Nav[i].className = "undis";
			}
		}
	}