move authorize so that it will only be executed once

app/views/projects/settings/_members.rhtml

@@ -5,6 +5,7 @@
 
 <div class="splitcontentleft">
 <% if members.any? %>
+  <% authorized = authorize_for('members', 'edit') %>
 <table class="list members">
 	<thead><tr>
 	  <th><%= l(:label_user) %> / <%= l(:label_group) %></th>
@@ -19,7 +20,7 @@
 	<td class="<%= member.principal.class.name.downcase %> <%= user_status_class member.principal%>" title="<%= user_status_i18n member.principal%>"><%= link_to_user member.principal %></td>
   <td class="roles">
     <span id="member-<%= member.id %>-roles"><%=h member.roles.sort.collect(&:to_s).join(', ') %></span>
-    <% if authorize_for('members', 'edit') %>
+    <% if authorized %>
       <% remote_form_for(:member, member, :url => {:controller => 'members', :action => 'edit', :id => member},
       																		:method => :post,
       																		:html => { :id => "member-#{member.id}-roles-form", :class => 'hol' }) do |f| %>