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// check the current post for the existence of a short code
function has_shortcode( $shortcode = NULL ) {

	$post_to_check = get_post( get_the_ID() );

	// false because we have to search through the post content first
	$found = false;

	// if no short code was provided, return false
	if ( ! $shortcode ) {
		return $found;
	}
	// check the post content for the short code
	if ( stripos( $post_to_check->post_content, '[' . $shortcode) !== FALSE ) {
		// we have found the short code
		$found = TRUE;
	}

	// return our final results
	return $found;
}