cooliris.embed.setFeedURL - How to make it work

I am new at javascript, and am trying to make a photo dynanmic wall based upon search criteria. I make the feed xml with php, then need to use the cooliris.embed.setFeedURL to display the photos chosen. I have made too many attempts to put all the code here. Does anyone have a simple example including the script and html that I can model my code on. Here is my last futile attempt:

<script type="text/javascript">

    var cooliris = {

        onEmbedInitialized : function() {

            alert("cooliris.embed is now available");

        cooliris.embed.setFeedURL("http://www.properties.com/site/include/temp/11c44b80a6a2f848eb9646b5b3e5df43.xml&numRows=2&showEmbed=false&showChrome=true&style=black");

        }

    }

    </script>

Cooliris displays, no pictures. The feed file works when hardcoded.

Thanks for any help.