function changeAndSubmitById(formName,fieldName,value) {
	var form = document.getElementById(formName);
	var field = document.getElementById(fieldName);
	field.value = value;
	
	location = form.action + '?event=' + form.event.value;
	//form.submit();
}
function changeAndSubmit(formName,fieldName,value){
	var form = document.forms[formName];
	form[fieldName].value = value;
	form.submit();
}
function disableChangeAndSubmit(formName,fieldName,value){
	var form = document.forms[formName];
	form["checkout"].disabled = true;
	form["changedetails"].disabled = true;
	changeAndSubmit(formName,fieldName,value);
}
function enableCashFields() {
	/*
	var field = document.getElementById('cashamount');
	field.disabled = false;
	*/
	
	//disable the others
	disableCheckFields();
	disableCreditCardFields();
}
function disableCashFields() {
/*
	var field = document.getElementById('cashamount');
	
	field.disabled = true;
	
	field.value = '';
*/
}
function enableCheckFields() {
	//var f1 = document.getElementById('checkamount');
	var f2 = document.getElementById('checknum');
	
	//f1.disabled = false;
	f2.disabled = false;
	
	disableCashFields();
	disableCreditCardFields();
}
function disableCheckFields() {
	//var f1 = document.getElementById('checkamount');
	var f2 = document.getElementById('checknum');
	
	//f1.disabled = true;
	f2.disabled = true;
	
	//f1.value = '';
	f2.value = '';
}
function enableCreditCardFields() {
	var f1 = document.getElementById('nameoncard');
	var f2 = document.getElementById('cardtype');
	var f3 = document.getElementById('cardnumber');
	var f4 = document.getElementById('cvv');
	var f5 = document.getElementById('expirationMonth');
	var f6 = document.getElementById('expirationYear');
	
	f1.disabled = false;
	f2.disabled = false;
	f3.disabled = false;
	f4.disabled = false;
	f5.disabled = false;
	f6.disabled = false;
	
	disableCashFields();
	disableCheckFields();
}
function disableCreditCardFields() {
	var f1 = document.getElementById('nameoncard');
	var f2 = document.getElementById('cardtype');
	var f3 = document.getElementById('cardnumber');
	var f4 = document.getElementById('cvv');
	var f5 = document.getElementById('expirationMonth');
	var f6 = document.getElementById('expirationYear');
	
	f1.disabled = true;
	f2.disabled = true;
	f3.disabled = true;
	f4.disabled = true;
	f5.disabled = true;
	f6.disabled = true;
	
	f1.value = '';
	f2.value = '';
	f3.value = '';
	f4.value = '';
	f5.value = '';
	f6.value = '';
}