How to get the lookup field value within SP APP

Hi All,

I am trying to display the value of a lookup field without any luck. I have two Lists

    List 1 Products: ProductID, Category, Notes

   List 2 Category: CategoryID, Title

The products list has a Category column that links to the Title column within the Category list.The code I am having problems with is show below:

function camlQueries() {

   var context = SP.ClientContext.get_current();

   var web = context.get_web();

   var list = web.get_lists().getByTitle("Products");

   var query =new SP.CamlQuery();

   query.set_viewXml("<View>"+

                       "<Query>"+

                       "<Where><Eq>"+

                       "<FieldRef Name='Category' "+

                           "LookupId='True' />"+

                       "<Value Type='Lookup'>1</Value>"+

                       "</Eq></Where>"+

                       "</Query>"+

                       "</View>");

   var items = list.getItems(query);

   context.load(web, "Title");

   context.load(items, "Include(ID, Title");

    //context.load(items, "Include(ID, Title, Category");

   context.executeQueryAsync(success, fail);

   function success() {

       var message = jQuery("#message");

       message.text(web.get_title());

       var ienum = items.getEnumerator();

       while (ienum.moveNext()) {

           message.append("<br />");

           message.append(ienum.get_current().get_item("Title")+ " - ");

          // message.append(ienum.get_current().get_item("Category"));

       }

   }

   function fail(sender, args) {

       alert("Call failed. Error: "+

           args.get_message());

   }

}

I hope you can help
Colin