Need some help with javascript & php please re Slideshow in a theme

[Timbow]

s_path = '<?php get_theme_url(); ?>/img/';

Thanks but I am still getting an error - 'last element of the items structure is undefined'

And isn't that giving me php tags inside of php tags?

Actually if I write the absolute path out in full (http://localhost/Holford/theme/Holford/img/) I still get the error so I don't know what is going on there.

I will try uploading it maybe it is a wampserver thing.