<li class="col2 <?php echo ($product->getPrice1()!=$product->price1? 'change':'')?>" id="col2"><?php echo Yii::app()->priceFormatter->format($product->getPrice1()); ?> </li>
<li class="col3 <?php echo ($product->getPrice2()!=$product->price2? 'change':'')?>"><?php echo Yii::app()->priceFormatter->format($product->getPrice2()); ?> </li>
<li class="col4 <?php echo ($product->getPrice3()!=$product->price3? 'change':'')?>"><?php echo Yii::app()->priceFormatter->format($product->getPrice3()); ?> </li>
<li class="col5 <?php echo ($product->getPrice4()!=$product->price4? 'change':'')?>"><?php echo Yii::app()->priceFormatter->format($product->getPrice4()); ?> </li>