Multi-quote icon doesn't look different enough when enabled

[Jason D. Cupp]

I love the work you're doing with the new Ubuntu standard theme. The only complaint I can still find is that when you click the multi-quote button on a post, it doesn't look much different from the unclicked multi-quote button. I don't think there is a problem with how the unclicked button looks. But when it's clicked, it should look different enough that it's easily noticeable.