This is where #ottotal appears in the HTML source:

HTML Code:
<div id="otshipping">
    <div class="vatBox larger forward"></div>
    <div class="totalBox larger forward">&pound;4.92</div>
    <div class="lineTitle larger forward">Royal Mail (2nd Class Tracked (Delivered normally within 2-5 working days of despatch)):</div>
</div>
<br class="clearBoth" />
<div id="ottax">
    <div class="vatBox larger forward"></div>
    <div class="totalBox larger forward">&pound;10.98</div>
    <div class="lineTitle larger forward">VAT 20%:</div>
</div>
<br class="clearBoth" />
<div id="ottotal">
    <div class="vatBox larger forward"></div>
    <div class="totalBox larger forward">&pound;65.89</div>
    <div class="lineTitle larger forward">Total:</div>
</div>