In message <fc.005b8e3400455aa23b9aca00dac4bd76.455aef@Xena.shu.ac.uk>, "Mark S. BOYLAN(EDS)" <M.S.Boylan@shu.ac.uk> writes [ snip] > >Hard to explain in words and I don't have pictures but mabe its enough to >get you going > Have a look at http://ilc.tsms.soton.ac.uk/caerdroia/f_intro.htm M. -- Mark Houghton mark@mhark.demon.co.uk