10=2 in binary Dieter, so the last 2 are numbered 2 and the first 2 are 1, so the next two are 3: http://www.questacon.edu.au/indepth/photonics/binary_code.html Grooly, Eli Stamp Replied to: And every fool knows that there are only 10 kinds of people in the world. Those who get binary and those who don't. Dieter :)#