<div id="user-avatar-display" class="submitbox" >
    <h3 ><?php _e('Profile Picture','user-avatar'); ?></h3>
    <p id="user-avatar-display-image"><?php echo user_avatar_get_avatar($current_user->ID, 150); ?></p>
    <a id="user-avatar-link" class="button-primary thickbox" href="<?php echo admin_url('admin-ajax.php'); ?>?action=user_avatar_add_photo&step=1&uid=<?php echo $current_user->ID; ?>&TB_iframe=true&width=720&height=450" title="<?php _e('Upload and Crop an Image to be Displayed','user-avatar'); ?>" ><?php _e('Update Picture','user-avatar'); ?></a>

    <?php
        // Remove the User-Avatar button if there is no uploaded image


        $remove_url = admin_url('admin.php?page=my_plugin_page')."?own_delete_avatar=true&_nononce=". wp_create_nonce('own_user_avatar')."&u=".$current_user->ID;//here I don't get it.

        if ( user_avatar_avatar_exists($current_user->ID) ):?>
            <a id="user-avatar-remove" class="submitdelete deleteaction" href="<?php echo esc_url_raw($remove_url); ?>" title="<?php _e('Remove Profile Image','user-avatar'); ?>" ><?php _e('Remove','user-avatar'); ?></a>
            <?php
        endif;
    ?>
    </div>
    <script type="text/javascript">

    function user_avatar_refresh_image(img){
     jQuery('#user-avatar-display-image').html(img);
    }
    </script>