I have a custom module, which will add skin css
<reference name="head">
<action method="addItem">
<type>skin_css</type>
<name>css/banner.css</name>
</action>
</reference>
finally it includes the css for me in base theme
http://localhost/m1/skin/frontend/base/default/css/banner.css
How can I make it load the css in current theme?