判断iframe是否加载完毕的方法（兼容ie和Firefox）

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<meta http-equiv="Content-Type" c>
<title>新建网页 1</title>
</head>

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<div align="center" style="position: absolute; width: 100px; height: 100px; z-index: 1; left:158px; top:17px" id="load"><img src="http://sysimages.tq.cn/images/analysis_images/ajax-loader.gif" /> loading 判断iframe是否加载完毕的方法（兼容ie和Firefox）

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<iframe style="visibility:hidden" onreadystatechange=stateChangeIE(this) onload=stateChangeFirefox(this) name="callframe" id="callframe" width="420" height="100" frameborder="0" scrolling="no" marginheight="0"></iframe>
<script>
    function stateChangeIE(_frame)
    {
     if (_frame.readyState=="interactive")//state: loading ,interactive,   complete
     {
       var loader = document.getElementById("load");
        loader.innerHTML      = "";
        loader.style.display = "none";
        _frame.style.visibility = "visible";
     }
    }
    function stateChangeFirefox(_frame)
    {
       var loader = document.getElementById("load");
        loader.innerHTML      = "";
        loader.style.display = "none";
        _frame.style.visibility = "visible";
    }
    callframe.location.href="http://www.hao123.com";
</script>
</body>
</html>