Refresh new messages automatically

Hi!
First of all sorry for my english, I'll try to make the better I can to be understanding. I'm using easysocial to build a website for a friend and I have recently realize that new messages are not automatically loaded in the conversation page. I have try to find a way to fixe it using Ajax but it still don't load new messages. I'm not an expert and I just need your help to know if refreshing the conversation page div is good enough to load new messages or is there some other files that I have to refresh with Ajax to load the new messages? I've hear about comet chat but I don't want to use it. I juste want to find a solution for the users not having to refresh the page manually.

Thanks for help and for the great job you are doing!