hardcode custom a post (change title url)

I want to change the url in every title post. If you now click on the title, you get the permalink. I want to change that in a custom url:

So:
<a href="http://wordpress-domain.com/?p=19" rel="bookmark" title="Permanent Link to Beste site">TITLE/a>

Would be:
<a href="http://custom-domain.com" rel="bookmark" title="title">TITLE/a>

AND

I want to add a screenshot like this:
<img src="http://grabber.developertool.net/Screenshot.ashx?u=www.custom-domain.com" />