pass the message parent element to allow deferred loading.

js/babl/public/index.html

				}
			}, { re: /.*/, fn: function(match) { return new Text(match[0]); }}];
			function expandWord(word) {
			function expandWord(word, msgEl) {
				for (var i = 0; i < word_matchers.length; i++) {
					var matcher = word_matchers[i];
					var match = word.match(matcher.re);
					if (match) {
						return matcher.fn(match);
						return matcher.fn(match, msgEl);
					}
				}
			}
				var words = msg.content.split(/\s/);
				for (var i = 0; i < words.length; i++) {
					msgEl.appendChild(new Text(" "));
					msgEl.appendChild(expandWord(words[i]));
					msgEl.appendChild(expandWord(words[i], msgEl));
				}
				messagesEl.appendChild(msgEl);
				if (window.scrollY >= window.scrollMaxY - 2 * inputEl.clientHeight) {