Enabling voting on my website

I am planning / hoping to put a function on 1 of my sites to allow users to vote ‘like/dislike’ on some pics I plan to add later.
Is there an application I can install that will allow this and also count the votes for me within a time scale? My site will be on wordpress if that helps.

Off Topic:

Since you are most likely looking for a WordPress plugin (which probably exists) this thread has been moved to the WordPress forum.

If you Google something like “WordPress voting” or “WordPress Polls” you will get a lot of results, so you may find something of use that way, such as Vote It Up or WP-Polls.