I looked and saw this in your andreas01.css file:

#content img {
padding: 1px;
display:inline;
background: #cccccc;
border: none;
}

The border is coming from your padding which is allowing the background color to show through.

Either change the background color to white (or maybe don't set a background color), or change your padding to 0 (and maybe add a margin of 1px instead?).

Hope that helps!

Perfect!

Thanks for the help. I'm a real n00b at this.

Cheers
Anthony