HTML frame/frameset not display the content

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HTML

hi all,

I have design a simple page with three frames as follows. Issue is only the content of the top frame is displayed but not the others. Any comment really appreciate.

<frameset rows="100,*" frameborder="0" border="0" framespacing="0">
    <frame name="topNav" src="top.htm">
        <frameset cols="200,*" frameborder="0" border="0" framespacing="0">
            <frame name="menu" src="menu.php" marginheight="0" marginwidth="0" scrolling="auto" noresize>
                <frame name="content" src="content.php" marginheight="0" marginwidth="0" scrolling="auto" noresize>
                    <noframes>
                        <p></p>
                    </noframes>
        </frameset>
</frameset>

I figured it out that the issue rises only with php pages, not with htm or html