title: jquery fullcalendar: is init done?
body: <p>I use this function to change the date for one calender (jquery fullcalender by arshaw). </p>
  
  <pre><code>function cal_gotoDate(d){
      console.log('cal_gotoDate ' + curCal + ' ' + d);    
      $('#calendar'+curCal).fullCalendar('gotoDate', d);
      cal_setTitle();
      return false;
  }
  </code></pre>
  
  <p>The problem: The calender will be loaded dynamicaly by using ajax. It can happen that the calender is not loaded when the user tries to change the date. Therefore i got an error if they are not initialized:</p>
  
  <pre><code>TypeError: $(...).fullCalendar is not a function
  </code></pre>
  
  <p>I would like to check if the fullcalender <code>$('#calendar'+curCal)</code> is initialized.</p>