Here is the random number generator at work:

Random number-
Refresh this page to get another number. The range is currently 0 to 21
Note: Numbering starts at 0. I'm a computer geek. It's easier that way :-)


Code:
function pickRandom(range) {
        if (Math.random)
               return Math.round(Math.random() * (range));
        else {
               var now=new Date();
               return (now.getTime()/1000) % (range+1);
        }
}

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