If you're looking to achieve a layout with a top div, left div (fixed), and right div for content, you can implement a mix of CSS, jQuery, and more. Here's a quick example:
For the CSS part:
#ScrollContent {
width: 80%;
height: auto;
outline: 1px solid;
position: absolute;
right: 0;
background: #C0C0C0;
clear: left;
}
#Menu {
width: 20%;
height: 100%;
position: fixed;
outline: 1px solid;
background: #92c452;
}
And here's an example using jQuery:
jQuery(document).ready(function(){
jQuery('#hideshow').live('click', function(event) {
jQuery('#Menu').toggle('show');
});
});
I've also put together a Fiddle to give you a basic idea. It may not be perfect, but I hope it guides you in the right direction.
Best of luck!