some small fixes: grey-out send button if not ready

nodejs/public/stylesheets/safechat.css

@@ -188,6 +188,10 @@ td:last-child {
 .clear {
   clear: both;
 }
+label[for=send] img {
+  opacity: 0.4;
+  filter: alpha(opacity=40); /* MSIE */
+}
 #msgs .msg {
   border: 1px solid black;
   margin: 1ex;