Sidebar function only display text but not html

I wanted to add a sidebar on my header in order to serve a header ad. I’ve opened up my functions.php and added the sidebar.

if ( function_exists('register_sidebar') )
     register_sidebar(array(
	    'name' => 'Header Spot',
	    'before_widget' => '',
        'after_widget' => '',
        'before_title' => '<h2>',
        'after_title' => '</h2>',
    ));

This code is being used by the theme that I purchased to add additional sidebars.

I then edited my header.php and added the function call like this

<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('Header Spot') ) : ?>
 			<?php endif; ?>

When I test it using the text widget I can see text, however when I try to add an img tag nothing displays.

Am I missing something? Do i need to configure something else?

Thanks for any help