jquery.fbready.js

(function(jq){
    var _events = [];
    var _FB = {
           count: 0
          ,interval : setInterval(function(){
              try{
                if(FB._session && (typeof FB._session !== 'undefined')){
                    clearInterval(_FB.interval);
                    jq.each(_events, function(indexhereisretarded,fn){
                      fn();
                    });
                    delete _events;
                    jq.fbReady = function(fn){
                      fn();
                    }
                } else {
                  throw new Error('`FB` has no session');
                }
              } catch(e){
                if(_FB.count++ > 100) {
                  clearInterval(_FB.interval);
                  throw new Error('`FB` hasn\'t become available.');
                }
              }
            },15)
        };
  
  
    jq.fbReady = (function(){
        return function(fn){
          _events.push(fn);
        };
    })();
    
})(jQuery);
  
/*
Usage:

$.fbReady(function(){
  console.log('FB is ready');
  FB.api('/me',function(response){
    console.log(response);
  });
});

*/