diff --git a/core/src/main/java/hudson/model/UpdateCenter.java b/core/src/main/java/hudson/model/UpdateCenter.java
index f1e6877616a1bb04d2fabce3cb5f2f248e9650df..a26fad32ee9c43249a8feec1838665f3829962d2 100644
--- a/core/src/main/java/hudson/model/UpdateCenter.java
+++ b/core/src/main/java/hudson/model/UpdateCenter.java
@@ -135,6 +135,21 @@ public class UpdateCenter implements ModelObject {
         }
     }
 
+    /**
+     * Returns a list of plugins that should be shown in the "available" tab.
+     * These are "all plugins - installed plugins".
+     */
+    public List<Plugin> getAvailables() {
+        List<Plugin> r = new ArrayList<Plugin>();
+        Data data = getData();
+        if(data ==null)     return Collections.emptyList();
+        for (Plugin p : data.plugins.values()) {
+            if(p.getInstalled()==null)
+                r.add(p);
+        }
+        return r;
+    }
+
     /**
      * Gets the information about a specific plugin.
      *
diff --git a/core/src/main/resources/hudson/PluginManager/available.jelly b/core/src/main/resources/hudson/PluginManager/available.jelly
index ce6269ff2e09eb9047dfab8e28949a32e2ce1f2a..1873a787c8c6daa0784499d5a19437e5bddd8edb 100644
--- a/core/src/main/resources/hudson/PluginManager/available.jelly
+++ b/core/src/main/resources/hudson/PluginManager/available.jelly
@@ -2,5 +2,5 @@
   List of available new plugins    
 -->
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
-  <local:table page="available" list="${app.updateCenter.data.plugins.values()}" xmlns:local="/hudson/PluginManager" />
+  <local:table page="available" list="${app.updateCenter.availables}" xmlns:local="/hudson/PluginManager" />
 </j:jelly>