<input type=button value=刷新 onclick="window.location.reload()">
<input type=button value=前进 onclick="window.history.Go(1)">
<input type=button value=后退 onclick="window.history.go(-1)">
<input type=button value=前进 onclick="window.history.forward()">
<input type=button value=后退 onclick="window.history.back()"> 后退+刷新<input type=button value=后退 onclick="window.history.go(-1);window.location.reload()">

  function onLoadPage(){
   if(event.srcElement.tagName=="SPAN"){
     oFrame=top.window.middle.frames[2];
     oTxt=event.srcElement.innerText;
     switch(oTxt){
       case "前 进":
         oFrame.history.go(1);
       case "后 退":
         oFrame.history.back();
       case "刷 新":
         oFrame.location.reload();
     }
   }
}