Step 1. Login to your store back end/admin panel.
Step 2. Navigate to the CMS > Pages and click on the page for which you want to add the Custom Javascript and Style CSS.
Step 3. Now Click on the Design Tab From the Left Side bar.
Step 4. Select your Page Layout from the drop down.
Step 5. In the Field “Layout Update XML” Put the code below as per your requirement and change the file name with your actual file name.
Adding Custom CSS:
<reference name="head"> <action method="addItem"> <type>skin_css</type><script>Your_CSS_File_Name.css</script> </action> </reference>
Or
<reference name="head"> <action method="addCss"> <type>skin_css</type> <stylesheet>Your_CSS_File_Name.css</stylesheet> </action> </reference>
Or
<reference name="head"> <action method="addCss"> <stylesheet>Your_CSS_File_Path/Your_CSS_File_Name.css</stylesheet> </action> </reference>
Adding Custom JavaScript:
<reference name="head"> <action method="addItem"> <type>skin_js</type><script>Your_JavaScript_File_Name.js</script> </action> </reference>
Or
<reference name="head"> <action method="addJs"> <type>skin_js</type> <script>Your_JavaScript_File_Name.js</script> </action> </reference>
Or
<reference name="head"> <action method="addJs"> <script>Your_JavaScript_File_Path/Your_JavaScript_File_Name.js</script> </action> </reference>
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