var obig=document.getElementById("big");
        function selectTag(showContent,selfObj){
                   var tag = document.getElementById("tags").getElementsByTagName("li");
          var taglength = tag.length;
          for(i=0; i<taglength; i++){
            tag[i].className = "";
          }
          selfObj.parentNode.className = "selectTag";
          for(i=0; j=document.getElementById("tagContent"+i); i++){
            j.style.display = "none";
          }
          document.getElementById(showContent).style.display = "block";
        }
	var x=0;
	function scrollTag(){
	var tags=document.getElementById("tags").getElementsByTagName("a");
		if(x<2){x=x+1}
		else
		x=0;
          var tag = document.getElementById("tags").getElementsByTagName("li");
          var taglength = tag.length;
          for(i=0; i<taglength; i++){
            tag[i].className = "";
          }
	  tags[x].parentNode.className = "selectTag";
	  for(i=0; j=document.getElementById("tagContent"+i);i++){
		 j.style.display="none";
		  }
		  document.getElementById("tagContent"+x).style.display="block";
		}
		var scrolll=setInterval(scrollTag,2000);
		function zhuan(){
		clearInterval(scrolll);
		}
		function jixu(){
		scrolll=setInterval(scrollTag,2000);
		}