Changed to ChainEvent and fixed a nil pointer in transact

cmd/mist/assets/examples/info.html

@@ -71,6 +71,10 @@
     document.querySelector("#gas_price").innerHTML = eth.gasPrice;
     document.querySelector("#mining").innerHTML = eth.mining;
     document.querySelector("#listening").innerHTML = eth.listening;
+    eth.watch('chain').changed(function() {
+		    document.querySelector("#number").innerHTML = eth.number;
+		     });
+
 </script>
 
 </html>