function checkForm() {
	for(var i = 1; i <= 5; i++){
		pcResult = checkPostCode(document.regForm["add" + i].value);
		if(pcResult != false){
			document.regForm["add" + i].value = pcResult;
			document.regForm.postcode.value = pcResult; }}
	if(document.regForm.name.value == ""){
		alert("Please enter a company name.");
		document.regForm.name.focus(); }
	else if(document.regForm.contact_email.value == ""){ 
		alert("Please Enter a Valid Email Address");
		document.regForm.contact_email.focus(); }
	else if(document.regForm.contact_email.value.indexOf('@')== -1){
		alert("Please Enter a Valid Email Address");
		document.regForm.contact_email.focus(); }
	else if(document.regForm.contact_email.value.indexOf('.')== -1){
		alert("Please Enter a Valid Email Address");
		document.regForm.contact_email.focus(); }
	else if(document.regForm.contact_email.value != document.regForm.email_conf.value){
		alert("The email addresses do not match.");
		document.regForm.contact_email.focus(); }
	else if(document.regForm.pass.value == ""){
		alert("Please enter a Password");
		document.regForm.pass.focus(); }
	else if((document.regForm.pass.value.length < 6)||(document.regForm.pass.value.length > 15)){
		alert("The Password must be between 6 and 15 characters");
		document.regForm.pass.focus(); }
	else if(document.regForm.pass.value != document.regForm.pass_conf.value){
		alert("The Passwords do not match.");
		document.regForm.pass.focus(); }
	else if((document.regForm.add1.value == "")||(document.regForm.town.value == ""))
		alert("Please enter your full address");
	else if(document.regForm.postcode.value == "")
		alert("Please enter a valid postcode");
	else if(document.regForm.contact_tel.value == ""){
		alert("Please enter a Telephone Number");
		document.regForm.contact_tel.focus(); }
	else document.regForm.submit(); }

function checkPostCode (toCheck) {
  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
  
  var pcexp = new Array ();
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1,2})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}[0-9]{1}" + alpha3 + "{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1}" + alpha4 +"{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  pcexp.push (/^(GIR)(\s*)(0AA)$/i);
  pcexp.push (/^(bfpo)(\s*)([0-9]{1,4})$/i);
  pcexp.push (/^(bfpo)(\s*)(c\/o\s*[0-9]{1,3})$/i);
  var postCode = toCheck;
  postCode = postCode.replace(/^\s*|\s*$/g,"");
  var valid = false;
  for ( var i=0; i<pcexp.length; i++) {
    if (pcexp[i].test(postCode)) {
      pcexp[i].exec(postCode);
      postCode = RegExp.$1.toUpperCase() + " " + RegExp.$3.toUpperCase();
      postCode = postCode.replace (/C\/O\s*/,"c/o ");
      valid = true;
      break;
    }
  }
  if (valid) {return postCode;} else return false; }