/***BUILD HEADER WIDGET***/
register_sidebars(1,
    array(
        'name' => 'HeaderAd',
        'before_widget' => '<li class="widget %2$s" id="%1$s">',
        'after_widget' => '</li>',
        'before_title' => '<h3>',
        'after_title' => '</h3>'
    )
);

function header_widget() { ?>
	<div id="header_widget_1" class="sidebar">
		<ul class="sidebar_list">
			
			
			<?php thesis_default_widget(3); ?>
			
		</ul>
	</div>
<?php }
add_action('thesis_hook_header', 'header_widget', '1');
/*** BUILD HEADER WIDGET END***/