I have the following setup in an asp form:
<form action=nextframe.asp .......>
<input type=text name=userfield1>
<input type=text name=userfield2>
<input type=submit name="run nextframe.asp">
<input type=button name="run another win" onclick="parent.Display.location.href='anotherwin.asp?var1=userfield1&var2=userfield2'