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author: yunus_es [+], Submitted: 04.08.05 4a

Array.prototype.average=function():Number{
 var all=0;
 for(var i=0;i<this.length;i++){
  all+=this[i];
 }
 return all/this.length;
}

usage

numbers=new Array(5,23,45,678,45,20);
trace(numbers.average());

//return 136