Controlling iframe content target

[Steve Richter]

Am I able to change the target=_self, _parent, ... attribute of a
document so that the document can break out of the iframe that contains
it?

for example, I would have a button outside of the iframe that contains
the document. click the button and the document is expanded to display
within the _parent of the iframe.

form has a target= attribute:
<form id="form1" target="_self" >

but what object represents the form in the code behind? I would like
to change the target attribute of that object to hopefully expand the
document into the _parent window.

thanks,

-Steve