Non CSS menu using IFRAMES - Need Opinion

[hinchb]

I have coded a Non-CSS menu using IFRAMES which I would like your opinion on.
It seems to work in all the browsers I've tested. Do you see any disadvantages in using something like this.

Here is the code.

<style>
#top {
position: absolute;
left: 4%;
TOP: 4%;
width: 92%;
height: 20%;
color: #ffffff;
background-color:#FFFFFF;
border-style: solid;
border-width: 1px
}
 
#center {
position: absolute;
TOP: 24%;
left: 23.5%;
width: 49%;
height: 65%;
color: #990000;
background-color:#FFFFFF;
border-style: solid;
border-width: 1px
}
</style>
 

<DIV ID="top">
 
<div style="position: absolute; height: 2%; top: 70.5%; left: 11.5%; width: 85%;">
<a href="homepageNEW2.htm" target="cwindow" onclick="window.frames['nwindow'].location='navblank.htm'">HOME</a> &nbsp;/&nbsp;
 
<a href="whoweare.htm" target="cwindow" onclick="window.frames['nwindow'].location='navwhoweare.htm'">WHO WE ARE</a> &nbsp;/&nbsp; 
 
<a href="productsNEW.htm" target="cwindow" onclick="window.frames['nwindow'].location='navproducts.htm'">OUR PRODUCTS</a> &nbsp;/&nbsp; 
 
<a href="onlineord.htm" target="cwindow" onclick="window.frames['nwindow'].location='navonlineord.htm'">ONLINE ORDERING</a> &nbsp;/&nbsp; 
 
<a href="indlinksns.htm" target="cwindow" onclick="window.frames['nwindow'].location='navindlinks.htm'">INDUSTRY LINKS</a> &nbsp;/&nbsp;
 
<a href="market.htm" target="cwindow" onclick="window.frames['nwindow'].location='navmarket.htm'">MARKET NEWS</a> &nbsp;/&nbsp;
 
<a href="contact.html" target="cwindow" onclick="window.frames['nwindow'].location='navcontact.htm'"> CONTACT LaGRASSO</a>
</div>
 
<div style="position: absolute; top: 85%; height: 15%; left: 1%; width: 98%;"><iframe name="nwindow" src="navblank.htm" marginwidth="0" marginheight="0" frameborder="0" scrolling="no"
height="100%" width="100%"> </iframe></div>
 
</DIV>
 
<DIV ID="center">
 
<div style="position: absolute; top: 0%; height: 100%; left: 1%; width: 98%;"><iframe name="cwindow" src="homepageNEW2.htm" marginwidth="0" marginheight="0" frameborder="0" height="96%" width="100%"> </iframe></div>
</DIV>
 

Thank You for your advice.
Bob