echo '<img src="../../images/delete.png" id="aaa" />aaa&nbsp;&nbsp;&nbsp;';  (working fine)

//define( 'ROOT_DIR', dirname(__FILE__) );  is in a file at root folder.
//i able to use this ROOT_DIR to include class files without any problem
//BUT, when I use it with photo image, it just not working!

echo '<img src="'.ROOT_DIR.'/images/delete.png" id="bbb" />bbb';

Beyler, yanlış ne herhangi bir fikir?