var isSubmitted = false;
function trickyButton() {
	var rx = /[a-zA-Z0-9]{10}/;
	var pc = document.getElementById("pc").value;
	state = rx.test(pc) ? false : true;
	state = isSubmitted ? true : state;
	document.forms['pf'].elements['ps'].disabled = state;
}
function disableForm() {
	document.forms['pf'].elements['ps'].disabled = true;
	document.getElementById("ps").value = "Ohh ja...";
	isSubmitted = true;
}
function disableButton() {
	document.forms['pf'].elements['ps'].disabled = true;
}