Hi - cheers for the reply.
It doesn't only ever happen on one web site. It happens where-ever there is a mailto link, eg If I create a mailto link in an excel sheet and then click on it, it opens 50 IE windows.
Even clicking on a mailto link in Opera on a page I have created myself, will open up 50 IE windows. Which as you can guess is really annoying.
*** No worries I've sorted it, I just re-installed IE6 and that seemed to do the trick**