For ages I have been diligently adding a javascript:blur(); call to my links to stop these little white lines appearing.  Now I have found the holy grail.

For example, previously I would have done this:

<a href="..." onfocus="blur()" > [LINK] </a>

This works great, but guaranteed the one that you forget to code will be the one that annoys you most. So, add it to the style sheet once – like this.

a:active { outline:none; }
a:focus { outline:none; }

Cool