Price/Image not updating on selection

[kingo_2k2]

http://www.heavenlygates.co.uk "Gate Builder" page - we had someone build this for us, it should change image/price when you select options from the right hand side, this works fine in Firefox, however in IE, the images do not change but the price updates, in Chrome the images change but the price does not change however the correct price is shown in the checkout page, any help would be awsome as we have paid someone to do this who has let us down.

Thanks Guys