Magento add javascript, js, or css based on configuration
Are you working on your brand new module which needs some JS or CSS included in the <head> section only if some config settings are made?
There are a few ways to accomplish this, but the simplest one is this one (Example for JS file located in /js folder. Use the appropriate method to include skin_js or skin_css):
in your local.xml or layout update file add
<layout>
<default>
<reference name="head">
<action ifconfig="path/to/configuration" method="addJs">
<script>pathto/script.js</script>
</action>
</reference>
</default>
</layout>