recognizing if submit button is clicked

I don't know - you haven't posted your page ;)

In this simple example, the PHP processing script would go into a file for processing, so let's call it "process.php".

Then you'd point to it via the form action attribute, so it is actioned once the form is posted;

Code:

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<form action="process.php" method="post">

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I suggest you Google a few PHP form tutorials first though.

@ Terry

It would be nice if you post the code you are working , then members can add your requirement in that code and it will understand and clear your doubts.