I tested the Kaprekar site on Win ME (Firefox 0.8, IE 6.0), Win XP Pro (Firefox 0.8, IE 6.0) and Red Hat Linix (Mozilla 0.7 and Konqueror 2.1.1). The site behaved normal ... hopefully should be the same using other browsers. If you encounter a problem, lemme know. It didn't seem to work too well on Amaya ... will check on that.