Thanks Nogdog,
Just got an answer from another forum that works on this: Create a named iframe and have the form action target the iframe. Must use "post" as the method -- "get" truncates the output for some reason.
CODE:
<form action="mycode.php" method="post" target="myframe">
...
</form>
<iframe name="myframe" ... >
</iframe>
Could not get regular frames to work for this -- only the iframe.