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I am wanting to create a category dropdown list outside of the widget area so added:

Code:

<?php wp_dropdown_categories( $args ); ?>

<script type="text/javascript">

/* <![CDATA[ */

        var dropdown = document.getElementById("cat");

        function onCatChange() {

                if ( dropdown.options[dropdown.selectedIndex].value > 0 ) {

                        location.href = "http://mysite.com/?cat="+dropdown.options[dropdown.selectedIndex].value;

                }

        }

        dropdown.onchange = onCatChange;

/* ]]> */

</script>

Which works fine, but my question is how do I add a default "- Select Model -" option to the list?

Grateful of any help, thanks <3