Need jquery+wordpress expert to implement a feature

I am building a wordpress site with custom post types for sports tournaments. On the individual page I want a "thumbs up" feature that allows logged in users to click the thumb which means they are attending the tournament. This should keep a running count for each post so that the info can be echoed out elsewhere in the site. I imagine this would be a custom field that the jquery thumb hooks into. Looking for someone who can have it done within 24 hours. Please see the photo attached to see what I mean.