As some may have worked out I've ditched the like button. Trying to get the colour and location right wasn't going to happen, and based on some feedback I've shutdown the plugin.
Anyhow based on feedback I think the way thanks will be better. So I've managed to get a better plugin. You will notice the say thanks option in the top of each post in a thread. It's extremely unobstrusive and therefore shouldn't Impact people.
If you want to use it, it's pretty simple. Hopefully for those wanting to try the feature lets see how we go.