During my template on my small wordpress i've got a css menu slider however the pages are listed while using wordpress function wordpress_list_pages

i have to add value="1" to the present page the user is on when im using wordpress_list_pages, what is the easiest method to do that?

the present code i'm using is-

<?php wp_list_pages('sort_column=menu_order&depth=1&title_li=');?>

wp_list_pages() adds a category named current_page_item. This can be used class to create current page item. See for more particulars - http://codex.wordpress.org/Function_Reference/wp_list_pages