There are things missing, maybe the css, don't know but this is not working for me. The jquery is not working at all.
There are a few things you should be aware of:
Not sure you understand the rel attribute for anchors, read this:http://www.w3schools.com/TAGS/att_a_rel.asp
You do not have an iframe in your code.
<div id="content"> </div>
is a div.
<iframe id="content" name="content" height="300px" width="400px"></iframe>
is an iframe.
Read this on target attribute http://www.w3schools.com/tags/att_a_target.asp
Your top ul and the div following are not necessary:
<!-- <div style="float: left;">-->
In order to get this to work I had to de-activate my FireFox tab plus options. I open everything in another browser tab. Your code would not work with my settings. That's the trouble with iframes.
When posting, your in the message box, just above that is a tool menu. Use the '#' hash mark to generate the tags you need to put your code into.