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author: v3nom [+], Submitted: 02.12.02 1p

Array.prototype.mcd = function(){
  var a,r;
  var b = this[this.length-1];
  for(i=this.length-2;i>=0;i--){
    a = this[i];
    do{
      //Euclides algorism
      if((r = a%b) == 0) break;
      a = b;
      b = r;
    }while(1);
  }
  return b;
}

usage

num = [16,36,8];
trace(num.mcd()); //outputs 4