With the arrows is up for agree and down for disagree?

It's actually more to do with whether the answer is helpful or not - that's why you can do if for the actual question itself as well. Up for helpful, down for not helpful. (Also the green tick next to that is for accepting the answer as being helpful enough or giving you all the information or support you needed - you can only accept one answer, and whichever one is accepted gets moved to the top of the list - I guess so that everyone else can see it easily. You can change your accepted answer though, it's not a final choice type thing). :)

Thanks,,thought it was but read rules and this all works ages ago before I signed up. :-)