chat example: .live is removed in latest jquery, use .submit

examples/chat.rb

@@ -49,7 +49,7 @@ __END__
   es.onmessage = function(e) { $('#chat').append(e.data + "\n") };
 
   // writing
-  $("form").live("submit", function(e) {
+  $("form").submit(function(e) {
     $.post('/', {msg: "<%= user %>: " + $('#msg').val()});
     $('#msg').val(''); $('#msg').focus();
     e.preventDefault();