Client sees dashed blue border on images in ie, cannot replicate

I have a site where the client is seeing a dashed border around images (using the img tag). If I had to guess, the style rule looks like it would read "2px dashed blue".

This only happens in IE apparently (version 8) and I cannot replicate it.

To try and resolve it, I have set the border to zero, and the border-style to none, neither of which worked apparently.

The only two browser plugins they're running are roboform and spybot S&D, neither of which I would expect to affect the css.

My css doesn't have any rules for dashed blue borders, and there are no inline styles. It's a straight HTML page, no server-side stuff or scripts.

Any ideas what could be causing this?

 

Could your client be referring to the focus that IE and other browser display when tabbing through links? It looks like a blue dotted 1px border.
Try adding

:focus {
    outline: 0;
}

Code (markup):

to your css just to see if it goes away.