Выбор категорий галочками в пользовательской части

function CategoryNewsSelection($categoryid = 0, $parentid = 0, $nocat = TRUE, $sublevelmarker = '', $returnstring = '') {
    global $cat_info, $user_group, $member_id;
    
    $allow_list = explode( ',', $user_group[$member_id['user_group']]['cat_allow_addnews'] );
    $spec_list = explode( ',', $user_group[$member_id['user_group']]['cat_add'] );

    $root_category = array ();
    
    if( $parentid == 0 ) {
        if( $nocat ) $returnstring .= '';
    } else {
        $sublevelmarker .= '   ';
    }
    
    if( count( $cat_info ) ) {
        
        foreach ( $cat_info as $cats ) {
            if( $cats['parentid'] == $parentid ) $root_category[] = $cats['id'];
        }
        
        if( count( $root_category ) ) {
            foreach ( $root_category as $id ) {
                
                if( $allow_list[0] == "all" or in_array( $id, $allow_list ) ) {
                    
                    if( $spec_list[0] == "all" or in_array( $id, $spec_list ) ) $color = "black";
                    else $color = "red";

                    $returnstring .= $sublevelmarker . "<input id=\"catlist_".$id."\" onchange=\"onCategoryChange(this.value)\" name=\"catlist[]\" type=\"checkbox\" value=\"".$id."\" ";
                    if( is_array( $categoryid ) ) {
                        foreach ( $categoryid as $element ) {
                            if( $element == $id ) $returnstring .= ' CHECKED ';
                        }
                    } elseif( $categoryid == $id ) $returnstring .= ' CHECKED ';
                    
                    $returnstring .= '/><label for=\"catlist_".$id."\" style=\"color: {$color}\">' . $cat_info[$id]['name'] . '</label><br />';
                }
                $returnstring = CategoryNewsSelection( $categoryid, $id, $nocat, $sublevelmarker, $returnstring );
            }
        }
    }
    return $returnstring;
}