Shortcode – How to call the url in the code

Hello,

I created my first shortcode. It was difficult but after several errors and trying again and again, it finally works. Now I’d like to improve it.

How can I have the path of the 2 files you will see in my code without writing all the path? I tried all the afternoon but not succeed; I do not know enough php.

For the skin file, I tried:

'skin' => "'. plugins_url() .'/jwplayer/six.xml",

But it returns : Error loading skin : File not found.

It seems that it is a little bit more complicated to do… Thank you in advance for your help. Sorry for my bad English.

PS: I know that exists a WordPress plugin for JWPlayer but I do not want to use it.

Here is the code that works:

function jo_video_jw($atts){
	extract(shortcode_atts(array(
		'myElement' => "myElement",
		'width' => "100%",
		'aspectratio' => '',
		'autostart' => "false",
		'file' => '',
		'skin' => "https://localhost/xxx/wp-content/plugins/jwplayer/six.xml",
		'image' => "https://localhost/xxx/wp-content/uploads/videos/messe.jpg"
	), $atts));

	$return = '<div id="'.$myElement.'">Loading the player...</div>

<script type="text/javascript">
{
	jwplayer("'.$myElement.'").setup({
	  autostart: "'.$autostart.'",
	  image: "'.$image.'",
	  width: "'.$width.'",
	  aspectratio: "'.$aspectratio.'",
	  skin: "'.$skin.'",
	  file: "'.$file.'",
	  });
}
</script>';
	return $return;
}
add_shortcode('video_jw','jo_video_jw');