Set skin on load

[shortpasta]

Using:
SmartGWT 3.1p-2012-11-23
SmartClient Version: v8.3p_2012-11-23/LGPL Development Only (built 2012-11-23)
GWT 2.5
FF 19

As a reference I looked at all posts I could find on the topic, and the showcase project itself.
I am trying to set the skin when the app loads to:
1. "Mobile" for mobiles
2. "Enterprise" otherwise
For now, I am setting the skin via the "skin" url parameter, such as "http://127.0.0.1:8888/?skin=Enterprise" so that I can test quickly

Here is the code:

Portal.gwt.xml

  <inherits name="com.smartgwt.SmartGwtNoTheme"/>
  <inherits name="com.smartgwt.tools.SmartGwtTools"/>
  <inherits name="com.smartclient.theme.enterprise.EnterpriseResources"/>
  <inherits name="com.smartclient.theme.enterpriseblue.EnterpriseBlueResources"/>
  <!--<inherits name="com.smartclient.theme.mobile.Mobile"/>-->
  <inherits name="com.smartclient.theme.simplicity.SimplicityResources"/>

Portal.hml:

    <!-- add a loading indicator -->
    <div id="loadingWrapper">
      <div id="loading">
        <div class="loadingIndicator">
        <img src="images/portal/icon/statusCodeAll.gif" width="36" height="36" style="margin-right:8px;float:left;vertical-align:top;"/>DoctorMeow<br/>
        <span id="loadingMsg">Loading...</span></div>
      </div>
    </div>
    
    <!-- load the skin, from smartgwt showcase/index.html -->
    <script type="text/javascript">
      
    // from http://stackoverflow.com/questions/979975/how-to-get-the-value-from-url-parameter
    // changed to return null instead of "" if a value is not set
    function gup(name, defaultValue){
      name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");  
      var regexS = "[\\?&]"+name+"=([^&#]*)";  
      var regex = new RegExp( regexS );  
      var results = regex.exec( window.location.href ); 
      if( results == null )    return defaultValue;  
      else    return results[1];
    }

    // url-specific processing
    var skin = gup ("skin", "Enterprise");
    var mobileFlag = gup ("mobile", "false");
    if (mobileFlag == "true") {
      skin = "Mobile";
    }
    alert ('skin: ' + skin)
    loadJavascriptFile ("portal/sc/skins/" + skin + "/load_skin.js?isc_version=8.3.js");
    </script>
    
    <!-- load the app -->
    <script type="text/javascript" language="javascript" src="portal/portal.nocache.js"></script>
  </body>
</html>

However, I ran into the following:
1. Visit "http://127.0.0.1:8888/?skin=Enterprise"
2. The code below shows a popup that says skin = Enterprise
3. The browser dev console shows that the following resource is not found - note that the skin is "standard" instead of "enterprise"

/portal/sc/skins/standard/images/DynamicForm/SelectItem_PickButton_icon.gif

4. I looked for the following, just in case, and it does not exist, so even if the skin name if Enterprise, it would not work

/portal/sc/skins/standard/images/DynamicForm/SelectItem_PickButton_icon.gif

I also ran into the following:
1. Add <inherits name="com.smartclient.theme.mobile.Mobile"/> to Portal.gwt.xml
2. Visit "http://127.0.0.1:8888/"
3. No matter how I set the skin, the skin used to render the app is Mobile
4. So I looked at portal/portal.nocache.js, and it includes this:

<\/script>',ic='sc/modules/ISC_RichTextEditor.js',jc='sc/modules/ISC_RichTextEditor.js"><\/script>',oc='sc/skins/Mobile/load_skin.js',pc='sc/skins/Mobile/load_skin.js"><\/script>',db='script',Pb='selectingPermutation',

5. It seems that when the Mobile skin is included, it wins over load_skin.js

Any ideas?