点击 刷新iframe 窗口

<script language="JavaScript">

function selectFrom(iFirstValue,iLastValue){
    var iChoces = Math.abs(iLastValue - iFirstValue) + 1;
    return Math.floor(Math.random() * iChoces + iFirstValue);
}
var iNum = selectFrom(1,100);

  function doSearch(){
     var iNum = selectFrom(1,100);
     parent.iframe1.location="http://digico.cublog.cn/stpage/"+iNum+".html";

     //点击后的刷新 
  }
</script>
<a onclick="doSearch();">刷新</a>

  

<iframe name="iframe1" src="http://digico.cublog.cn/stpage/1.html" scrolling='no' frameborder='0' allowtransparency='true' width=118% height=180></iframe>

<script language="javascript">
document.frames[0].location.href="http://digico.cublog.cn/stpage/"+iNum+".html";

//页面正常刷新后，赋于iframe src 的值
  </script>