Custom field parse error

I am trying to use the following code in my theme, but am returning an error listed bellow:

The Code:
<?php
$my_values = get_post_meta( $post->ID, 'tape_popup', true );
if( $my_values ) {
echo "<form><input type="button" value="Popup the MP3 Player" onClick="javascript:popUp('http://www.mydomain.com/popup/' . $my_values . '.html')"></form>";
} else {
echo 'No popup yet';
}
?>

The Error:
Parse error: syntax error, unexpected T_STRING, expecting ',' or ';' in /home/user/public_html/wp-content/themes/Trill/single.php on line 47

Any help would be much appreciated!