How about, when an individual sequence is displayed, we have 'back' and 'next' buttons, to improve casual sequence browsing? Jon Perry perry at globalnet.co.uk http://www.users.globalnet.co.uk/~perry/maths/ http://www.users.globalnet.co.uk/~perry/DIVMenu/ BrainBench MVP for HTML and JavaScript http://www.brainbench.com