[Plugin: WP Android Shortcode] Change Image Path and Use Jquery

First, the plug in is great! thanks so much.
But i want to know 2 things.
i need to change the source of the image of the “download”.
i see in your php file and say:
$badge_url = plugins_url(‘/images/android_badge.png’, $this->plugin_file);
how to change that to take the picture from an external web? (http://www.othersite/image.png)

and the second thing is remove the lightbox for use jquery.
i only change this this:
return ‘<p>‘.$badge_html.’</p>’;
for this right?
return ‘<p>‘.$badge_html.’</p>’;