How to add external JavaScript file to Magento, so it\'s code would be included on every frontend page?
Create/edit the following:
app/design/frontend/PATH/TO/YOURTHEME/layout/local.xml
Make it look like so--should be self explanatory...
<!-- Add an EXTERNAL stylesheets -->
<action method="addLinkRel"><rel>stylesheet</rel><href>https://fonts.googleapis.com/css?family=Roboto+Condensed:300italic,400,300,700|Open+Sans:300italic,400,300</href></action>
<!-- Add an EXTERNAL javascript -->
<action method="addLinkRel"><rel>text/javascript</rel><href>https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js</href></action>
<!-- Add stylesheets from your local theme directory located in skin/frontend/ -->
<action method="addCss"><stylesheet>css/styles.css</stylesheet></action>
<!-- Add javascript from your local theme directory located in skin/frontend/ -->
<action method="addJs"><script>bootstrap.min.js</script></action>
<block type="core/text" name="jquery">
<action method="setText">
<text>
<![CDATA[<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.min.js?ver=3.9.2"></script>]]>
</text>
</action>
</block>