You don't say what the problem is, only that it is not working, so I'll have a guess.
You will also have to set the correct path to ZeroClipboard.swf
Are you sure that you are linking to these properly.
If these files are both in the same folder as your plugin then I would suggest you reference them along the lines of:
$plugin_url = WP_PLUGIN_URL.'/'.str_replace(basename( __FILE__),"",plugin_basename(__FILE__));
$zero_clipboard_js = $plugin_url . 'ZeroClipboard.js';
$zero_clipboard_swf = $plugin_url . 'ZeroClipboard.swf';
If your plugin is loading everything correctly then your problem is likely with Zero Clipboard, not Wordpress, so maybe find a forum related to that instead.
Maybe will help, maybe not