linking/syncing the chat application on a website to android

Can anyone point me to a tutorial that can show me how to be able to chat with customers that make queries from a web chat on my mobile? I have been searching and I cant find one. I would like to use javascript and jquery if possible so that I can be able to plug it into all our sites no matter which language they were developed in .

So in summary if a user sends a message on anyone of our websites I want to be able to reply them on my phone if I am not in my office