I have a problem for add a simple JavaScript on my admin dashboard.
I have create a local.xml with my folder theme but no result.
www\app\design\adminhtml\mytheme\default\layout\local.xml
<layout>
<default>
<reference name="head">
<action method="addJs"><script>mytheme/jquery.js</script></action>
</reference>
</default>
</layout>
Thanks for your help.