I'm trying to develop a XHTML complaint website, my site has frames but I'm encountering a problem with setting the border="1" on my frameset in that its not XHTML compliant. I have used frameborder="1" which is but I can't stylise the border.

Is there a way to achieve the same effect bu by using XHTML compliant code ? All I want is a thin black line going down the righthand-side of my frame no matter how much content is in the frame.

Before, anyone suggests ditching the frames, the site is highly data driven and having everything in one page wouldn't be practical!

have you tried style="border-right: black 2px solid" or similar?

border: 1px solid #000;