why not just use tables for now?
HTML Code:
<html>
<body>
<center><img src=logo.img></center>
<table width=100% height=100% border=0 cellspacing=1 cellpadding=5>
<tr>
<td width=125 valign=top>Left Side</td>
<td valign=top>Content</td>
<td width=125 valign=top>Right Side</td>
</tr>
</table>
</body>
</html>
you can always assign styles to the td cells, .. or put div's inside the cells if you want to re-use some of your existing css.