brocolee,

Your columns aren't moving around - your images are different heights and so don't push everything else down the same amount.

Short of making all your images the same height, you can try this:

#indexProductList .centerBoxContentsProducts a {
display: table-cell;
vertical-align: middle;
height: 80px;
}

I know it works in FF3, but didn't test it in any other browsers.

BrandTim