Как се добавя prefix в chatbox-а

$(window).load(function() {
  var chatbox_script = function() {
    var overrided = Chatbox.prototype.refresh;
    Chatbox.prototype.refresh = function(data) {
      overrided.call(this, data);
      $('.chatbox-username').each(function(){
        this.previousSibling&&$.trim(this.previousSibling.nodeValue)=="@"&&$(this.previousSibling).replaceWith('<img src="https://i.servimg.com/u/f18/16/34/78/03/s1szkx10.gif" /> ')
      })
    };
  };
  var s=document.createElement('script');s.text="("+chatbox_script.toString()+")();";$('object[data^="/chatbox/index.forum"],iframe[src^="/chatbox/index.forum"]').each(function(){try{$(this.contentDocument||this.contentWindow.document).find("#chatbox").closest("html").find("head").first().each(function(){this.appendChild(s.cloneNode(true))})}catch(a){}})
});