I have solved it but I'm not certain if it is meant to be solved like this

To say before I start: The "SecureUI" folder I write about is the EPiServer UI folder, I named it "SecureUI" at installation.

I had help from the following:
http://labs.episerver.com/en/Blogs/Mari-Jorgensen/Dates/111987/112010/Lessons-learned-Module-Conversion/

where I found that I have to register the following:
<script type="text/javascript" src="<%= EPiServer.UriSupport.ResolveUrlFromUtilBySettings("javascript/episerverscriptmanager.js") %>"></script>
<script type="text/javascript" src="<%= EPiServer.UriSupport.ResolveUrlFromUIBySettings("javascript/system.js") %>"></script>
<script type="text/javascript" src="<%= EPiServer.UriSupport.ResolveUrlFromUIBySettings("javascript/system.aspx") %>"></script>

I do this in my masterpage.

But if I'm not logged in as admin or editor I get an javascript exception because I dont have access to "SecureUI/javascript/system.aspx".

I have read this before, about Virtual Path Providers and UrlMappings
http://epicms.blogspot.com/2007/03/no-alternate-files-and-it-really-makes.html

So I added the following urlmappings in web.config:
<virtualPathMappings>
    <add url="~/Util/javascript/system.js" mappedUrl="~/SecureUI/javascript/system.js" />
    <add url="~/Util/javascript/system.aspx" mappedUrl="~/SecureUI/javascript/system.aspx" />
</virtualPathMappings>

And I also changed the following lines in my masterpage, ResolveUrlFromUtilBySettings instead of ResolveUrlFromUIBySettings:
<script type="text/javascript" src="<%= EPiServer.UriSupport.ResolveUrlFromUtilBySettings("javascript/system.js") %>"></script>
<script type="text/javascript" src="<%= EPiServer.UriSupport.ResolveUrlFromUtilBySettings("javascript/system.aspx") %>"></script>

Now it works! But is it meant to be done like this?

Regards Hans

Thanks Greger!

/Hans