create menu using iframe

Hi,

I want to create menu using iframe instead of master pages. Pl help me on this.
I tried and facing error. Pl look at it and give us solution.

aspx
<div class="line number1 index0 alt2"><div id="div_page_content"></div> <div class="line number2 index1 alt1">        <div id="div_left_nav"></div> <div class="line number3 index2 alt2">< ...