<div class="content_right">
        <div class="content_left">
            <div class="content">
            </div>
        </div>
    </div>

.content_left { background: url(   "images/content_bg.png" ) repeat-y; width: 100%;}
.content_right { background: url(  "images/content_bg.png" ) repeat-y right; width: 100%;}
.content { width:auto;margin: 5px; padding:0px;}