added to functions.php 2011 child 4 widgets

/**
 * Count the number of footer sidebars to enable dynamic classes for the footer
 */
function twentyelevenchild_footer_sidebar_class() {
    $count = 0;

    if ( is_active_sidebar( 'sidebar-3' ) )
        $count++;

    if ( is_active_sidebar( 'sidebar-4' ) )
        $count++;

    if ( is_active_sidebar( 'sidebar-5' ) )
        $count++;

    if ( is_active_sidebar( 'sidebar-6' ) ) //the fourth new one//
        $count++;

    $class = '';

    switch ( $count ) {
        case '1':
            $class = 'one';
            break;
        case '2':
            $class = 'two';
            break;
        case '3':
            $class = 'three';
            break;
        case '4':
            $class = 'four';
            break;
    }

    if ( $class )
        echo 'class="' . $class . '"';
}