A. Add the following markup in header.php file just before the line which looks like <div ="wrapper">
<div id="xtra-container">
<div class="new-leftsidebar">
// code for sidebar goes here
</div><!-- .new-leftsidebar -->
B. Add the following markup in footer.php file just after the line which looks like </div><!-- #wrapper -->
<div class="new-rightsidebar">
// code for sidebar goes here
</div><!-- .new-rightsidebar -->
</di><!-- #xtra-container -->
C. Add the following to your style.css file:
#xtra-container {
clear: both;
overflow: hidden;
padding: 0;
position: relative;
width: 1700px;
}
.new-leftsidebar {
float: left;
position: fixed;
top: 0;
width: 200px;
}
.new-rightsidebar {
float: right;
position: fixed;
top: 0;
width: 200px;
}