Wordpress help please

[LouiseLloyd]

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

<?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

[LouiseLloyd]

Figured it out, but thanks for looking :D