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problem with iframe

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i set a iframe in b.aspx,and if set it as
<iframe id=”frm1” src=”xxxxxxxxxxxxxx.aspx?para1=<%=var1%>”></iframe>
,on some client pc the iframe can not be rendered to ie.and the result of
'view source' of b.aspx,i can noly file a '</iframe>' tag ,the '<iframe
id...' lost.

but if set the iframe as <iframe id=”frm1” src=””></iframe> and use a js to
set its src dynamiclly like this
<script language=”javascript”>
var ifrm = document.getElementById(“frm1”);
if (typeof(ifrm) != ‘undefined’ && ifrm != null)
ifrm.src=” xxxxxxxxxxxxxx.aspx?para1=<%=var1%>”;
,everything goes ok.

why? is there any difference between the two way?
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