Update

Solved this, it was the inner most div needing to have auto height, as it had a fixed height that I'd completely overlooked

I have - like many others I have searched and found - tried to make an expandable DIV that expands based on the length of it's contents. Mine is a little different from those I have seen so far, as I have variables coming from external Controllers to display, but aside from this what I am trying to achieve is the same. I have created a DIV that contains an image that I repeat-y in the background, however the internal content DIV doesn't want to expand. I will post my code for some clarity -

<div id="feedback_question" class="span-14">
<div id="title_bar">
    <img id="brand_image" src="<?php echo img_path() . $title_row[0]->filename;?>">
    <div id="brand_text">
        <div id="brand_title"><?php echo $title_row[0]->name;?></div>
        <div id="brand_description"><?php echo $title_row[0]->description;?></div>
    </div>
</div>

<div id="background_stretch">
    <div id="question_background">
        <div id="question_tabs" class="span-14">
            <ul id="tab_list">
                <?php for($i = 1; $i <= $maxQuestions; $i++) { ?>
                <li class="tab" id="tab_<?php echo $i; ?>">
                    Q<?php echo $i; ?>
                </li>
                <?php }; ?>
            </ul>
            <div class="question_body">
            <!--Load question template here -->
            <?php echo $questions?>
            </div>
        </div>
    </div>
    <div id="bottom_section">
        <div id="bottom_button_