For better performance, delete comment element from page rather than reloading entire list via AJAX after removing a comment.
One small disadvantage: the "Be the first to leave a comment!" message no longer appears if the last comment is deleted; this seems like a reasonable price for better performance.

Style fixes.

Made refreshTagList smarter (no need to make AJAX request for tags if there is no element on screen to hold the resulting list).
Progress on style fixes.

Added some missing global declarations.

Fixed confusing variable naming in "add to cart" closure; increased efficiency by leaving the function as soon as a duplicate is found.

jslint style fixes: added global declarations and reordered functions so that declarations precede calls.

Cleaned up whitespace; moved document ready function to end of file for jslint compliance (avoid undefined function errors).

jslint style fixes (global directive for path variable defined externally; put function definition before call to that function for clarity).