$(document).ready(function(){
   var jc = new JC();
   jc.init();

   function JC(){
      this.init = function(){
         img = $("img[src=jcaptcha]");
         img.bind("click", jc.changeCaptcha);
      }

      this.changeCaptcha = function(){
         $.get("jcaptcha", function(data){
            if(data){
               ms = new Date().getTime();
               img = $("img#jcaptcha");
               img.fadeOut("fast", function(){
                  img.replaceWith("<img id=\"jcaptcha\" src=\"jcaptcha?"+ms+"\" style=\"display:none;\" />");
                  img = $("img#jcaptcha");
                  img.bind("click", jc.changeCaptcha);
                  img.fadeIn();
               });
            }
         });
      }
   }
});