<iframe src="http://www.163.com" id="ice"></iframe>
<script language="javascript">
<!--
var frame = document.getElementById("ice");
frame.onreadystatechange = function(){
if( this.readyState == "complete" )
alert('加载完毕!');
}
//-->
</script>
---------------------------------------------------------------
<script>
function loadWindow()
{
if(frm.document.readyState == "complete")
alert("加载完成!");
else
setTimeout("loadWindow()", 500)
}
loadWindow()
</script>