When viewing my site through Safari I see an icon with a magnifying glass icon in a square on the right end of the main navigation bar following the search field. Looks great. Placing the cursor over the icon causes the icon to turn a darker shade of great. Super.
In Firefox, the icon is not present, but the words "Submit Query" are; although with no good looking alignment halfway beneath the right end of the search field. When I place the cursor over the text "Submit Query" it flashes a bit, disappears, and the missing icon shows up. When I move the cursor away, the icon disappears and the "Submit Query" text comes back.