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I detect problem with php function isset() on F4. It worked fine on earlier versions of Firefox. Is this software bug, or I can do something?

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I detect problem with php function isset() on F4. It worked fine on earlier versions of Firefox. When I press submit button, the php isset function should be triggered, but in F4 it's not work.

Is this software bug, or I can do something to fix it and recommend other users of my web site to fix it too?

Notes:

  • Web site is in Serbian language.
  • Web site provides materials for students and uses many php functions and SQL queries.
I detect problem with php function isset() on F4. It worked fine on earlier versions of Firefox. When I press submit button, the php isset function should be triggered, but in F4 it's not work. Is this software bug, or I can do something to fix it and recommend other users of my web site to fix it too? Notes: *Web site is in Serbian language. *Web site provides materials for students and uses many php functions and SQL queries.

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I found that the problem is not php isset function, but <input type="image"> html tag. I change to <input type="submit"> and now it's work. But, on other browsers and earlier versions of Firefox the <input type="image"> is worked.

Sorry if my english is not excellent, but I think that you understand what I am talking about.