timthumb issue in WordPress MU

Can anyone please tell me how to use this code in WordPress MU.

MY Theme has got his code as timthumb function

[Code moderated as per the Forum Rules. Please use the pastebin]

and then these images are called in the page using this format –

<?php echo catch_that_image (get_the_id(), '', '', '' .get_bloginfo('template_url') .'/scripts/timthumb.php?zc=1&w=166&h=166&src='); ?>

So this works fine in Normal WordPress but doesn’t fetch images in WordPress MU. I studied a lot and i am aware that wordpress MU requires some modifications in timthumb so that exact path can be fetched. However, i am not able to add the correct path to fetch automatically in this code.

Looking for urgent help from experts and users