Check if connected to a network; jQuery

Question

I have searched through StackOverflow and have seen various topics on how to do this, but nothing that really pertains to my particular situation. I am writing (for a class)

Answer 1

try to set up ajaxSetup to do a request every n milliseconds (i put 1000 here) and check if it times out and then disable button.

$.ajaxSetup({
    timeout: 1000, 
    error: function(request, status, maybe_an_exception_object) {
        if(status != 'timeout')
            //Code to enable button
        else
             //Code to disable button
    }
});