OK, I've got a mean problem. My site was tested with IE and Firefox and all seemed to work well. All of a sudden Mozilla-based browsers and MAC Safari browsers do not work right on my site (http://www.justdeejays.com). Here is what I found:

Horizontal and vertical spacing does not work right

When a customer increments a quantity in the cart the numbers that used to go up and down properly now skip odd numbers

Customers who wish to become members can't submit the form.

There are probably other issues not yet noticed. Can someone help me understand how to code for other than IE browsers please?

Joe