Displaying product image in Firefox.

When I click on a product image for the first time, the only thing that happens is the screen dims as the sbox-overlay class is applied but no image is displayed. Click the browser's back button, display the product again and click on the image and it is displayed correctly.

This doesn't happen in IE or Safari - only in Firefox (V5).

Any ideas?

Heck, and I thought that I'd searched the forum thoroughly - sorry.

OK I've implemented the work-around for this. Thanks.