/**
 * _teaserthumb_get_thumbnail_from_body($node)
 */



$src:		/sites/default/files/images/angry-birds-2.png
    |
    V
$src_url: 	public://images/angry-birds-2.png



$src:		/sites/default/files/images/angry-birds-2.png
    |
  $new_url = image_style_url('thumbnail', $src);
    |
    V
$new_url: 	http://d7.kddala.com/sites/default/files/styles/thumbnail/public//sites/default/files/images/angry-birds-2.png

NOTE: $new_url is NOT used!!!



$src_url: 	public://images/angry-birds-2.png
    |
  $new_path = image_style_path('thumbnail', $src_url);
    |
    V
$new_path: 	public://styles/thumbnail/public/images/angry-birds-2.png
    |
  $url_base = str_replace('public:/', $file_public_path, $new_path);
    |
    V
$url_base: 	sites/default/files/styles/thumbnail/public/images/angry-birds-2.png
    |
  $url = url($url_base); 
    |
    V
$url: 		/sites/default/files/styles/thumbnail/public/images/angry-birds-2.png


-----------------------------------------------------------------
Before: <img src="/sites/default/files/images/angry-birds-2.png" />

After : <img src="/sites/default/files/styles/thumbnail/public/images/angry-birds-2.png" />