If so, a lot of contemporary mathematics would flow easily... But jokes aside, what is the concept that binds my 1 to your 1? Jon Perry perry@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