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hmm... more information? What were you doing at the time? Any other problems? 3rd party RAM?
 
mostly just browsing, messenger mac, ichat, mail, and photoshop opened,

those are the app i have on all the time.

some days its beeps like right now its not but yesterday like every 10 sec almost

its the beep sound of when you click somewhere thats not supposed to be clicked.
 
Or that it's beeping to show that friends are coming in and out.

The best way to check it?

Log in as another user (make one if need be) and see if the beeping happens there.

Otherwise, reduce the apps you're using to bare bones, and then add one at a time and test until the beep appears.
 
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