var cur_index=1
var num=4 
var settime
function GetObj(objName){
 if(document.getElementById){
  return eval('document.getElementById("' + objName + '")');
 }else if(document.layers){
  return eval("document.layers['" + objName +"']");
 }else{
  return eval('document.all.' + objName);
 }
}
function change_one(index){
 for(var i=1;i<=num;i++){/* 最多支持8个标签 */
  if(GetObj("number"+i)&&GetObj("m"+i)){
   GetObj("number"+i).style.display = 'none';
   GetObj("m"+i).className = "two"+i+"Off";
  }
 }
 if(GetObj("number"+index)&&GetObj("m"+index)){
  GetObj("number"+index).style.display = 'block';
  GetObj("m"+index).className = "two"+index+"On";
 }
 cur_index=index
 if(cur_index<num){
    cur_index++
   }
 else{
     cur_index=1
   }
 settime=setTimeout("change_one(cur_index)",4000)
}
function one(c_index){
  clearTimeout(settime)
  change_one(c_index)
 }
     
change_one(1);