I am glad you solved it with css, but using iframes is still not a good idea. I thought rather on something like this:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>load demo</title>
<style>
body{ font-size: 12px; font-family: Arial; }
table{ width: 100%; }
td {border: 1px solid red;}
#content {border: 1px solid green; width: 100%; height: auto;}
</style>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script>
var pages = 3;
var page = 0;
function load(inc){
page = (page + inc) % pages;
$("#content").load("/page"+(page+1)+".html");
if(page==0) $("#prev").hide(); else $("#prev").show();
if(page==pages-1) $("#next").hide(); else $("#next").show();
}
$(function() {
load(0);
});
</script>
</head>
<body>
<table>
<tr>
<td></td>
<td width="70%" align="center">
<div id="content">
</div>
<a id="prev" href="#" onClick="load(-1);"><img class="imgCustom1" src="../Images1/previous.png" align="left" alt="Previous page"></a>
<a id="next" href="#" onClick="load(+1);"><img class="imgCustom1" src="../Images/Next.png" align="right" alt="Next page"></a>
</td>
<td></td>
</tr>
</table>
</body>
</html>