Wordpress: A categories dropdown menu

<form action="<?php bloginfo('url'); ?>/" method="get" class="dropcats" >
		<?php
			$select = wp_dropdown_categories('show_option_none=Επιλέξτε Κατηγορία:&show_count=0&heirarchial=1&orderby=ID&echo=0');
			$select = preg_replace("#<select([^>]*)>#", "<select$1 onchange='return this.form.submit()'>", $select);
			echo $select;
		?>
		<noscript><input type="submit" value="View" /></noscript>
		</form>