I added this to themes:
add_theme_support( 'post-thumbnails');
if ( function_exists('register_sidebar') )
register_sidebar(array(
'name' => 'Footer Widgets Left',
'before_widget' => '<li class="widget %2$s" id="%1$s">',
'after_widget' => '</li>',
'before_title' => '<h3>',
'after_title' => '</h3>'
));
if ( function_exists('register_sidebar') )
register_sidebar(array(
'name' => 'Footer Widgets Middle',
'before_widget' => '<li class="widget %2$s" id="%1$s">',
'after_widget' => '</li>',
'before_title' => '<h3>',
'after_title' => '</h3>'
));
if ( function_exists('register_sidebar') )
register_sidebar(array(
'name' => 'Footer Widgets Right',
'before_widget' => '<li class="widget %2$s" id="%1$s">',
'after_widget' => '</li>',
'before_title' => '<h3>',
'after_title' => '</h3>'
));
function my_widgetized_footer() { ?>
<div id="footer-widget-block">
<div class="my-footer-one footer-widgets sidebar">
<ul class="sidebar_list">
<?php thesis_default_widget(3); ?>
</ul>
</div>
<div class="my-footer-two footer-widgets sidebar">
<ul class="sidebar_list">
<?php thesis_default_widget(4); ?>
</ul>
</div>
<div class="my-footer-three footer-widgets sidebar">
<ul class="sidebar_list">
<?php thesis_default_widget(5); ?>
</ul>
</div>
</div>
<?php
}
add_action('thesis_hook_footer','my_widgetized_footer','1');
and this to the css:
.custom #footer-widget-block { text-align:left; overflow:hidden; }
.custom .footer-widgets { width:33%; float:left; }
.custom .my-footer-one {}
.custom .my-footer-two {}
.custom .my-footer-three {}