.htaccess referer problem

I am trying to pass referer info to a script. However my code does not work. It gives referer, as jpg file. How to fix that?

RewriteEngine On

RewriteRule ^([A-Za-z/0-9-]+)\.png$ http://www.heyimage.com/script.php?img=$1&type=png&ref=%{HTTP_REFERER} [L,NS]
RewriteRule ^([A-Za-z/0-9-]+)\.jpg$ http://www.heyimage.com/script.php?img=$1&type=jpg&ref=%{HTTP_REFERER} [L,NS]
RewriteRule ^([A-Za-z/0-9-]+)\.gif$ http://www.heyimage.com/script.php?img=$1&type=gif&ref=%{HTTP_REFERER} [L,NS]

Code (markup):

 

it will never match your regular expression. Try without the ^ on the rules