if(!function_exists('nabia_custom_bg')) {
    function nabia_custom_bg() {
        global $post;

        if( is_singular(array('post', 'page')) && get_post_meta( $post->ID, 'nabia_cmb_post_bimg', true) ) {
            $background = get_post_meta( $post->ID, 'nabia_cmb_post_bimg', true);
        } else {
            $background = get_background_image();
        }
        if( is_singular(array('post', 'page')) && get_post_meta( $post->ID, 'nabia_cmb_post_bg_color', true) ) {
            $color = get_post_meta($post->ID, 'nabia_cmb_post_bg_color', true);
        } else {
            $color = get_background_color();
        }

        if ( ! $background && ! $color )
            return;

        if( is_singular(array('post', 'page')) && get_post_meta( $post->ID, 'nabia_cmb_post_bg_color', true) ) {
            $style = $color ? "background-color: $color;" : '';
        } else {
            $style = $color ? "background-color: #$color;" : '';
        }

        if ( $background ) {
            $image = " background-image: url($background);";


            if( is_singular(array('post', 'page')) && get_post_meta( $post->ID, 'nabia_cmb_post_bg_repeat', true) && get_post_meta( $post->ID, 'nabia_cmb_post_bimg', true) ) {
                $repeat = get_post_meta( $post->ID, 'nabia_cmb_post_bg_repeat', true);
            } else {
                $repeat = nabia_theme_mod( 'background_repeat' );
            }

            if ( ! in_array( $repeat, array( 'no-repeat', 'repeat-x', 'repeat-y', 'repeat' ) ) )
                $repeat = 'repeat';

            $repeat = " background-repeat: $repeat;";

            if( is_singular(array('post', 'page')) && get_post_meta( $post->ID, 'nabia_cmb_post_bg_position', true) && get_post_meta( $post->ID, 'nabia_cmb_post_bimg', true) ) {
                $position = get_post_meta( $post->ID, 'nabia_cmb_post_bg_position', true);
            } else {
                $position = nabia_theme_mod( 'background_position_x' );
            }

            if ( ! in_array( $position, array( 'center', 'right', 'left' ) ) )
                $position = 'left';

            $position = " background-position: top $position;";

            if( is_singular(array('post', 'page')) && get_post_meta( $post->ID, 'nabia_cmb_post_bg_attachament', true) && get_post_meta( $post->ID, 'nabia_cmb_post_bimg', true) ) {
                $attachment = get_post_meta( $post->ID, 'nabia_cmb_post_bg_attachament', true);
            } else {
                $attachment = nabia_theme_mod( 'background_attachment' );
            }

            if ( ! in_array( $attachment, array( 'fixed', 'scroll' ) ) )
                $attachment = 'scroll';

            $attachment = " background-attachment: $attachment;";

            $style .= $image . $repeat . $position . $attachment;
        }
        ?>
        <style type="text/css">
        body.custom-background { <?php echo esc_attr( $style ); ?> }
        </style>

    <?php
    }
}