Like / Dislike Button I need to like AND to dislike contenttyps, but the total likes should be displayed as Likes - Dislikes. I tried to use the "flag" module and created two different flags (one for likes, one for dislikes) but this leaves me with two problems


I need to get the total count of the likes (likes - dislikes) within a view - how can I do this??
Can I disable the like/dislike button, if it was already clicked? So you can like and dislike but only once (no toggle).
You might be able to customize the excellent tutorial on the use of Ajax for Like and Dislike using voting API by Amitav Roy. His primary purpose is to show the reader how to use AJAX, but the code is solid and seems to suit your purpose.