function removeDupls( ar )
{
  var i = 0;

  while ( i < ar.length )  {
    var j = i + 1;

    while ( j < ar.length && ar[i] != ar[j] )
      j ++;;

    if ( j < ar.length )  {

      for ( var k = i; k < ar.length-1; k ++ )
        ar[k] = ar[k+1];

      ar.length--;
    }
    else
      i ++;
  }
}