Replace use of Event with jQuery methods

Versions of OpenLayers before 2.12 provided a global Event object
but this has now been removed, so use jQuery methods instead.

app/views/changeset/_map.html.erb

@@ -37,7 +37,7 @@
     $("#tr-changeset-" + id).removeClass("selected");
   }
 
-  function init() {
+  $(document).ready(function () {
     var map = createMap("changeset_list_map", {
       controls: [
         new OpenLayers.Control.Navigation(),
@@ -84,7 +84,5 @@
     <% else %>
       map.zoomToExtent(proj(bounds));
     <% end %>
-  }
-
-  Event.observe(window, "load", init);
+  });
 </script>

app/views/site/index.html.erb

@@ -288,7 +288,7 @@ end
   $(document).ready(function () {
     $("#exportanchor").click(function (e) {
       $.ajax({ url: "<%= url_for :controller => :export, :action => :start %>" });
-      Event.stop(e);
+      e.preventDefault();
     });
 
     <% if params[:action] == 'export' -%>