iframe问题

在1.htm里插了一个iframe，name=iframe1 src=2.htm
2.htm里有"

1<div id="id1"></div>

"
那么我在1.htm里怎么给id1的innerHTML赋值，请高手告诉我。
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document.frames[0].document.all.id1.innerHTML="yourcode"
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1<script language="Vbscript">   
2parent.window.iframe1.idl.innerHTML="Are You Ok？"   
3</script>

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document.all.iframe1.document.all.id1.innerHTML='';
or
iframe1.document.all.id1.innerHTML='';
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1<script language="javascript">   
2window.iframe1.idl.innerHTML="Are You Ok？"   
3</script>