WordPress MU

Okk say for example I want to bring up a image for the author...

I know its this if they are all in the same blog... -

<img src="<?php bloginfo('template_directory') ?>/authors/<?php the_author_ID()?>.jpg" alt="<?php the_author(); ?>" title="<?php the_author(); ?>" />

But say if I have different blogs...

like

mysite.com/hairysblog

and

mysite.com/jerrysblog

What would be the code then to bring up there blog.. I believe i am not getting the folders correct.