wFORMS.showAlertOnError = false;
wFORMS.behaviors['validation'].errMsg_integer = "Please enter only numbers";
wFORMS.behaviors['validation'].errMsg_required = "Please complete this field";

function $() {
	var elements = new Array();
	for (var i = 0; i < arguments.length; i++) {
		var element = arguments[i];
		if (typeof element == 'string')
			element = document.getElementById(element);
		if (arguments.length == 1)
			return element;
		elements.push(element);
	}
	return elements;
}

function voucherPB(e) {
	if(!e) e = window.event;
	$('form_failmsg').innerHTML = '';
	$('form_failmsg').style.display = 'none';
	var ok = wFORMS.behaviors['validation'].run(e);

	if(!checkPostCode($('postcode').value)) {
		ok = false;
		var errorMessage = "This is not a valid postcode";
		wFORMS.behaviors['validation'].showError($("postcode"), errorMessage);
	}

	$('postcode').value = formatPostcode($('postcode').value);

	if(ok) {

		if($('voucher_number').value != $('voucher_numberconf').value) {
			ok = false;
			$('form_failmsg').style.display = 'block';
			var errorMessage = "Voucher confirmation failed, please make sure both fields match";
			$('form_failmsg').innerHTML = errorMessage;
			$('form_failmsg').style.display = 'block';
		}

	}
	if(!ok) {
		return wFORMS.helpers.preventEvent(e);
		return false;
	}
	return true;
}

function detailsPB(e) {
	if(!e) e = window.event;
	$('form_failmsg').innerHTML = '';
	$('form_failmsg').style.display = 'none';
	var ok = wFORMS.behaviors['validation'].run(e);

	if(!checkPostCode($('postcode').value)) {
		ok = false;
		var errorMessage = "This is not a valid postcode";
		wFORMS.behaviors['validation'].showError($("postcode"), errorMessage);
	}

	$('postcode').value = formatPostcode($('postcode').value);

	if(!ok) {
		return wFORMS.helpers.preventEvent(e);
		return false;
	}
	return true;
}

function checkPostCode (toCheck) {

	// Permitted letters depend upon their position in the postcode.
	var alpha1 = "[abcdefghijklmnoprstuwyz]";                       // Character 1
	var alpha2 = "[abcdefghklmnopqrstuvwxy]";                       // Character 2
	var alpha3 = "[abcdefghjkstuw]";                                // Character 3
	var alpha4 = "[abehmnprvwxy]";                                  // Character 4
	var alpha5 = "[abdefghjlnpqrstuwxyz]";                          // Character 5

	// Array holds the regular expressions for the valid postcodes
	var pcexp = new Array ();

	// Expression for postcodes: AN NAA, ANN NAA, AAN NAA, and AANN NAA
	pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1,2})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));

	// Expression for postcodes: ANA NAA
	pcexp.push (new RegExp ("^(" + alpha1 + "{1}[0-9]{1}" + alpha3 + "{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));

	// Expression for postcodes: AANA  NAA
	pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1}" + alpha4 +"{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));

	// Exception for the special postcode GIR 0AA
	pcexp.push (/^(GIR)(\s*)(0AA)$/i);

	// Standard BFPO numbers
	pcexp.push (/^(bfpo)(\s*)([0-9]{1,4})$/i);

	// c/o BFPO numbers
	pcexp.push (/^(bfpo)(\s*)(c\/o\s*[0-9]{1,3})$/i);

	// Overseas Territories
	pcexp.push (/^([A-Z]{4})(\s*)(1ZZ)$/i);

	// Load up the string to check
	var postCode = toCheck;

	// Assume we're not going to find a valid postcode
	var valid = false;

	// Check the string against the types of post codes
	for ( var i=0; i<pcexp.length; i++) {
		if (pcexp[i].test(postCode)) {

			// The post code is valid - split the post code into component parts
			pcexp[i].exec(postCode);

			// Copy it back into the original string, converting it to uppercase and
			// inserting a space between the inward and outward codes
			postCode = RegExp.$1.toUpperCase() + " " + RegExp.$3.toUpperCase();

			// If it is a BFPO c/o type postcode, tidy up the "c/o" part
			postCode = postCode.replace (/C\/O\s*/,"c/o ");

			// Load new postcode back into the form element
			valid = true;

			// Remember that we have found that the code is valid and break from loop
			break;
		}
	}

	// Return with either the reformatted valid postcode or the original invalid
	// postcode
	if (valid) {return postCode;} else return false;
}

/* formats a VALID postcode nicely: AB120XY -> AB1 0XY */
function formatPostcode(p) {
	if (checkPostCode(p)) {
		var postcodeRegEx = /(^[A-Z]{1,2}[0-9]{1,2})([0-9][A-Z]{2}$)/i;
		return p.replace(postcodeRegEx,"$1 $2");
	} else {
		return p;
	}
}