function go_to(tid,hx,box,pr){
 var hxs=document.getElementById(tid).getElementsByTagName(hx);
 var boxs=document.getElementById(tid).getElementsByTagName(box);
 for(var i=0;i<hxs.length;i++){
  if(!hxs[i].tmpClass){
   hxs[i].tmpClass=hxs[i].className+" pr1984_com";
   boxs[i].tmpClass=boxs[i].className+" pr1984_com";
  }
  if(pr-1==i){
   hxs[i].className=hxs[i].tmpClass+" up";
   boxs[i].className=boxs[i].tmpClass+" up";
  }
  else {
   hxs[i].className=hxs[i].tmpClass;
   boxs[i].className=boxs[i].tmpClass;
  }
 }
}