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I had a requirement to add a multi-level responsive drop down menu in a Zyxware theme. Please do refer the below reference links to know more about responsive themes and free Drupal themes. So for that I had to edit page.tpl.php, page--front.tpl.php, style.css, template.php etc.
First I added the following code to template.php of my theme. The steps that I followed here are,