Add php within a javascript block.

I have a block of javascript code, and one of the lines shows the following:

a.addVar("movie", "/films/kidnap.flv");

I’m trying to figure out how to add the following line in there, to replace the "/films/kidnap.flv" section.

I am trying to replace it with this:
<?php echo get_post_meta($post->ID, 'filmorshow', true); ?>
I can’t figure out how to do it though.

I did try this, but no luck:
a.addVar("movie", "<?php echo get_post_meta($post->ID, 'filmorshow', true); ?>");

Thanks