strong Please select... font-family: sans-serif; font-size: normal; color: Navy; login loginorregister // must have the name of the (phpfunction) function loginorregister(form) { var v = form.get_value(form, "login"); if ("login" == v[0]) { form.val_off("new_username", "lri"); form.val_off("new_password1", "lri"); form.val_off("new_password2", "lri"); form.val_on("username", "lri"); form.val_on("password", "lri"); } else { form.val_off("username", "lri"); form.val_off("password", "lri"); form.val_on("new_username", "lri"); form.val_on("new_password1", "lri"); form.val_on("new_password2", "lri"); } } Please enter your username. Please enter your password. register Please choose a username. Enter a new password. You have to enter your password twice. passagain function passagain(form) { var v = form.get_value(form, "login"); var p1 = form.get_value(form, "new_password1"); var p2 = form.get_value(form, "new_password2"); if ("register" == v[0] && p1[0] != p2[0]) form.set_err("new_password2", "Enter the password again. The first one is different from the second."); } Login