Trying to make a fixed navigation bar/menu in iWeb

Question

This has been posted before I just can't make it work. I want a nav bar (I already designed it in iweb, then moved its files and folder to another location) loaded on a snippet to have a fixed position just like in this example:
http://dl.dropbox.com/u/3563737/Lycos/Fixed.html
Here's the code that's in the "Html Snippet" that I'm trying and it does absolutely nothing, I still can scroll the object with the page:
<iframe id = "topmenu" SRC = "file://localhost/Users/MacHD/web/menu.html"
FRAMEBORDER = "0" MARGINWIDTH = "0px" MARGINHEIGHT = "0px" SCROLLING="no" ALLOWTRANSPARENCY="true" width="1024px" height="200px"
</iframe>
<script language="JavaScript" type="text/javascript">
<!--
elem = parent.document.getElementById('topmenu');
elem.style.position='fixed';
// -->
</script>
Thanks!

Answer 1

Absolutely no prob.
the page is this one:  http://fidas.com.br/Fidas_do_Brasil_Transportes/test.html
I load the menu from another page (see the HTML Snippet code bellow):
<iframe id = "topmenu" SRC = "http://fidas.com.br/menu.html"
FRAMEBORDER = "0" MARGINWIDTH = "0px" MARGINHEIGHT = "0px" SCROLLING="no"
ALLOWTRANSPARENCY="true"
width="1024px",
height="200px"
</iframe>
<script language="JavaScript" type="text/javascript">
<!--
elem = parent.document.getElementById('topmenu');
elem.style.position='fixed';
// -->
</script>;