\makebox(width,height)[position]{ ...  }

  The \makebox command for the picture environment is similar to the
  normal \makebox command except that you must specify a width and
  height in multiples of \unitlength.

  The optional argument, [position], specifies the quadrant that your
  text appears in.  You may select up to two of the following:

   -  t:  Moves the item to the top of the rectangle

   -  b:  Moves the item to the bottom

   -  l:  Moves the item to the left

   -  r:  Moves the item to the right