try using something like this
<html>
<head>
<title>Definición de Frames</title>
</head>
<frameset rows="15%,*">
<frame src="pagina1.html" name="paginaFrame">
<frame src="index.php" name="indexFrame">
</frameset>
</html>
use the name function to assign an id to the frames.
then when you create a link to another page you want to open in the frame set the frame you want it to open up in as the target of the link using the frame id
<a href="link" target="paginaFrame"> link text </a>
see if this will fix your problem
