function autoTab(input, len) {
	if(input.value.length >= len) {
		input.value = input.value.slice(0, len);
		input.form[(getIndex(input)+1) % input.form.length].focus();
}
function getIndex(input) {
var index = -1, i = 0, found = false;
while (i < input.form.length && index == -1)
	if (input.form[i] == input) {
		index = i;
	}else i++;
	return index;
}
return true;
}