//全站共用选项卡函数
function setTab(tagId,tagOrder,num){
 for(i=1;i<=num;i++){
  var menu=document.getElementById(tagId+i);
  var con=document.getElementById("cont_"+tagId+i);
  menu.className=i==tagOrder?"tag_on":"tag_off";
  con.style.display=i==tagOrder?"block":"none";
 }
}