[рони]

Aetae,

<script language="JavaScript" type="text/javascript">
function random(val,min,max,l)
{var arr = [],m = [],n = void(0), len = max-min;
  l--;
  if (len < l) return;
  for (var i=0; i<= len; i++){
      m[i] = i + min;
      m[i] == val && (n = i);
  }
  n !=  void(0) &&  m.splice(n,1)
  for (var i=0; i<l; i++) {n = Math.floor(Math.random()*(m.length)); arr[i]=m.splice(n,1);};
  n = Math.floor(Math.random()*(arr.length));
  arr.splice(n,0,val)
  return arr
}
document.write(random(3,0,20,4))
</script>

источник )))