Automaticly adding class to links

Ok, first of, Hi. My name is Patric and I'm a total newbi on scripting of any kind. I have stumbled upon a site popup preview script from ShrinkTheWeb.com.

Now this one shows a popup preview when adding a class to any given link. Now there is a tweak to this. And this is to have that class autonaticly added to ANY link on the site without manually putting the class in there.

This code:

<script type="text/javascript"> 
$(document).ready(function() { 
$("a").each(function() { 
var cur_source = $(this).attr("href"); 
if (cur_source) { 
if (cur_source.search("http://") != -1) { 
$(this).addClass("stwpopup"); 
} 
} 
}) 
}); 
</script> 
 

Code (markup):

Now, Applying this to my site, makes every link show a popup preview. Even those which are on my own site (internal links). How is it possible to exclude a domain in that piece of code I posted ?

The opposite of this I can do, hehe that's easy. It's just to add a domain name to:

<script type="text/javascript"> 
$(document).ready(function() { 
$("a").each(function() { 
var cur_source = $(this).attr("href"); 
if (cur_source) { 
if (cur_source.search("http://DOMAIN NAME.COM") != -1) { 
$(this).addClass("stwpopup"); 
} 
} 
}) 
}); 
</script> 

Code (markup):

This is making every link WITHIN my domain use the preview, but no other. How can I make it the opposite, that is NOT show my internal links.

Regards Patric.

 

if (cur_source.search("http://") != -1 && cur_source.search("mydomain.com") == -1) {