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,5000);
function zhuan(){
clearInterval(scrolll);
}
function jixu(){
scrolll=setInterval(scrollTag,5000);
}