Change attachment link formatting?

[Trevor Harmon]

Attachment tags for HTTP links are large and visually distracting, so  
I usually turn them off in the Document Display inspector. That way,  
HTTP links look and act much more like traditional web browser links.  
However, the look is so subtle that it's almost invisible! All I see  
on each link is one very thin light blue underline. It's so thin that  
it's almost invisible.

To fix this problem, I'd like to make the text of HTTP links blue  
(like normal web browers) so that they are easily detected. But this  
doesn't seem possible. I've tried selecting the Citation style in the  
style pane, then changing the font attributes, but that has no  
effect. Is there another way? Thanks,

Trevor