I'm not sure you know about this, but Spark has a DefaultResourcePathManager that will automatically locate the root of the site if you prefix the resource with a tilde, so this should work fine and looks more neat.
<img alt="" src="~/images/screenshots/myImage.jpg" />
... ! , , , (CDN) - Spark Module.dll, dll .
, CDN, , , Spark:
<resources>
<add match="/content/images" location="http://mycdn.com/youraccount/images"/>
<add match="/content/css" location="http://mycdn.com/youraccount/css"/>
<add match="/content/js" location="http://mycdn.com/youraccount/js"/>
</resources>
... . .