implement api level toggling
 and rename navtree.js to android-developer-reference.js for all reference related scripts
 TODO: shading for hidden classes in the treeview navigation... these aren't dynamic yet.
diff --git a/tools/droiddoc/src/PackageInfo.java b/tools/droiddoc/src/PackageInfo.java
index bcf3cf3..18c636e 100644
--- a/tools/droiddoc/src/PackageInfo.java
+++ b/tools/droiddoc/src/PackageInfo.java
@@ -123,6 +123,7 @@
         ClassInfo.makeLinkListHDF(data, base + ".enums", enums());
         ClassInfo.makeLinkListHDF(data, base + ".exceptions", exceptions());
         ClassInfo.makeLinkListHDF(data, base + ".errors", errors());
+        data.setValue(base + ".since", getSince());
     }
 
     public ClassInfo[] interfaces()