Wordpress Shortcode

<!-- /*create category shortcode*/ -->
<?php
    function ag_short_category(){   
        global $post;
        $tax = get_taxonomy('ag_movie_type');
        $name = $tax -> labels -> name;  
        $args = array(
            'type'          => 'ag_movie_reviews',
            'hide_empty'    => 0,                       
            'taxonomy'      => 'ag_movie_type',
        ); 

        $categories = get_categories( $args );                              
    ?>
        <h3 class="p2"><?php echo $name;?></h3>                                    
        <ul class="list-1">
        <?php foreach ( $categories as $term ):  ?>
            <li><a href="" id="<?php echo $term->term_id; ?>"><?php echo $term -> name;?></a></li>
        <?php endforeach;?>                         
        </ul>
<?php 
    }

    add_shortcode('ag_category', 'ag_short_category');  
?>

This is my code for creating shortcode. The code is work. But when i activating code, i can't upload images or video url. What is the problem?? thanks.

via Chebli Mohamed