判断iframe是否加载完成

  var iframe01 = document.getElementById("If01");
  iframe01.src = "http://www.studyofnet.com";
  if(iframe01.attachEvent)...{
   iframe01.attachEvent("onload", function()...{
     //其它处理代码
   });
  } else...{
   iframe01.onload = function()...{
     //其它处理代码
   };
  }