why I got "response already committed" exception

[Mu Mike]

I have a body.jsp jsp page which has a statement like this 

<jsp:include page="<%=snapshotHtml%>" flush="true"/>

there exists also a form in the jsp page

<form id="myform" action="myaction" >
<input type=submit onlcick="dosub();"/>
...
<form>

<scripts>
dosub()
{
 myform.target=window.opener.name;
 myform.submit();
}
now I opened body.jsp in a "<iframe>" which exists in another jsp page, but 
when I submitted the form, there threw the exception "response already 
committed" ,why? and how can I solve this problem?

Thanks&Regards
Mike
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