Site 1 - function file v1

 <?php
        /*
            * Functions file
            * Includes all necesary files
            *
            * @package custom
            */


        function register_my_menus() {
             register_nav_menus(
               array(
                 'primary-menu' = __( 'Primary Menu' ),
                 'secondary-menu' = __( 'Secondary Menu' )
               )
             );
        }
        add_action( 'init', 'register_my_menus' );

        function custom_widgets_init() {
                register_sidebar(
                        array(
                                'name' = 'Rotate Pics Sidebar',
                                'id' = 'rotate_pics',
                                'before_widget' = '<div',
                                'after_widget' = '</div',
                                'before_title' = '<h2 class="rounded',
                                'after_title' = '</h2',
                        )
                );

                register_sidebar(
                        array(
                                'name' = 'Articles Sidebar',
                                'id' = 'articles',
                                'before_widget' = '<div',
                                'after_widget' = '</div',
                                'before_title' = '<h2 class="rounded',
                        'after_title' = '</h2',
                        )
                );
        }

        /* this function scans thru the directory received and loads the image files
         names into an array; Then returns a random name to the caller
        */
        function  GetImageName($DirName)
                {
                 $file = 'debugtrace.txt';
                 $Img = array();  // define array

                 // image types accepted:  jpg png gif
                 $ImgPath = $DirName . '/' . '{*.jpg,*.gif,*.png}';


                 file_put_contents($file, $ImgPath); // Write trace

                 foreach (glob($ImgPath, GLOB_BRACE) as $filename)
                 {
                  if (is_readable($filename))
                        $Img[]  = $filename;  // found image file
                 }

                 file_put_contents($file, $Img, FILE_APPEND ); // Write trace

                 $Imgcount = sizeof($Img) - 1; // the index is zero-based
                 if ($Imgcount <= 0)
                    return "/wp-content/themes/custom/img/rotatepics/pic1.jpg";
                 else
                 {
                  $rand_image_ix = rand(0,$Imgcount);
                  return $Img[$rand_image_ix];  // return name of image
                 }
        }


                // function to print the random image

        function ShowRandomImg($size_x=300, $size_y=228)
                {
                 $DirNm = "/wp-content/themes/custom/img/rotatepics";  // current directory

                 if (is_front_page() || is_page('contact') )
                 {
                  $DirNm = $DirNm  . "/contact";
                  $ImgNm = GetImageName($DirNm);  // retrieve random image from directory "contact"
                 }
                 elseif (is_page('references') )
                 {
                  $DirNm = $DirNm  . "/references";
                  $ImgNm = GetImageName($DirNm);  // retrieve random image from directory "references"
                 }
                 elseif (is_page('services') )
                 {
                  $DirNm = $DirNm  . "/services";
                  $ImgNm = GetImageName($DirNm);  // retrieve random image from directory "services"
                 }
                 else
                 {
                  $ImgNm = GetImageName($DirNm);  // retrieve random image from current directory
                 }


                 $file = 'debugtrace.txt';
                 file_put_contents($file, $DirNm, FILE_APPEND ); // Write trace
                 file_put_contents($file, $ImgNm, FILE_APPEND ); // Write trace

                 $ImgTag =  '<img src="' . $ImgNm . '" width="' . $size_x . '" height="' . $size_y . '"  alt="' . $ImgNm . '">';
                 file_put_contents($file, $ImgTag, FILE_APPEND ); // Write trace

                 echo $ImgTag;

$content = ob_get_contents();
    ob_end_clean();
    return $content;

add_shortcode("ShowRandomImg", " ShowRandomImg");

}

?>