title: Set certain position of FlxSprite's loadgraphic method
body: <p>I have a 122 * 16 image.
  It has seven colors, and I use only one color per block.</p>
  
  <p>But, <code>loadGraphic()</code> in the <code>FlxSprite</code> class just uses <code>width</code> and <code>height</code>.</p>
  
  <p>How do I use certain position of image?</p>
  
  <p>For example, if I choose 0, <code>loadGraphic()</code> picks up the position width, height(0 to 15, 16), choose 1, (17 ~ 31, 16)</p>