Seems as though despite the width of the divs being 33% there is some additional padding somewhere.
Code:
<div class="centerBoxWrapper" id="whatsNew">
<h2 class="centerBoxHeading">New Products For February</h2>
<div class="centerBoxContentsNew centeredContent back" style="width: 33%;"><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=419"><img src="images/J9171.jpg" alt="J9171" title=" J9171 " width="80" height="120"></a><br><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=419">J9171</a><br>£290.00</div>
<div class="centerBoxContentsNew centeredContent back" style="width: 33%;"><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=418"><img src="images/J9169.jpg" alt="J9169" title=" J9169 " width="80" height="120"></a><br><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=418">J9169</a><br>£290.00</div>
<div class="centerBoxContentsNew centeredContent back" style="width: 33%;"><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=417"><img src="images/J9167.jpg" alt="J9167" title=" J9167 " width="80" height="120"></a><br><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=417">J9167</a><br>£310.00</div>
<br class="clearBoth">
<div class="centerBoxContentsNew centeredContent back" style="width: 33%;"><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=416"><img src="images/J9165.jpg" alt="J9165" title=" J9165 " width="80" height="120"></a><br><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=416">J9165</a><br>£255.00</div>
<div class="centerBoxContentsNew centeredContent back" style="width: 33%;"><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=415"><img src="images/J9163.jpg" alt="J9163" title=" J9163 " width="80" height="120"></a><br><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=415">J9163</a><br>£305.00</div>
<div class="centerBoxContentsNew centeredContent back" style="width: 33%;"><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=414"><img src="images/J9162.jpg" alt="J9162" title=" J9162 " width="80" height="120"></a><br><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=414">J9162</a><br>£270.00</div>
<br class="clearBoth">
<div class="centerBoxContentsNew centeredContent back" style="width: 33%;"><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=413"><img src="images/J9158.jpg" alt="J9158" title=" J9158 " width="80" height="120"></a><br><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=413">J9158</a><br>£330.00</div>
<div class="centerBoxContentsNew centeredContent back" style="width: 33%;"><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=412"><img src="images/J9157.jpg" alt="J9157" title=" J9157 " width="80" height="120"></a><br><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=412">J9157</a><br>£290.00</div>
<div class="centerBoxContentsNew centeredContent back" style="width: 33%;"><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=411"><img src="images/J9156.jpg" alt="J9156" title=" J9156 " width="80" height="120"></a><br><a href="http://store.glitz-prom.com/index.php?main_page=product_info&cPath=0&products_id=411">J9156</a><br>£315.00</div>
<br class="clearBoth">
</div>
Covers a single row of what should be 3 images. Is it likely that any padding in one of - centerBoxContentsNew centeredContent back - might be causing this misalignment.
Actually having just gone for it it seems that the padding was causing the issue. Must try harder next time, thanks for looking