function showform() {
	MM_showHideLayers('form','','show');
}

function closeform() {
	MM_showHideLayers('form','','hide');
}

function checkPostCode (toCheck,Country) {
  if(Country != 'UK') return 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);

  // 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;
}

function checkdata() {
	var d=document.forms[0];
	var issind=d.start_issue.selectedIndex;
	var tind=d.title.selectedIndex;
	var namefirst=d.firstname.value;
	var namelast=d.surname.value;
	var ad1=d.add1.value;
	var town=d.town.value;
	var countryind=d.country.selectedIndex;
	var pcode=d.postcode.value;
	var deladdr='';
	if (d.SameAsBilling[0].checked)
		deladdr='yes';
	if (d.SameAsBilling[1].checked)
		deladdr='no';	
	var telphone=d.tel1.value;
	var e=d.email.value;
	var econf=d.emailconf.value;
	var lf=String.fromCharCode(10) + 'Please check the details and retry!';
	if (issind<=0 || tind<=0 || namefirst=='' || namelast=='' || ad1=='' || town=='' || countryind<=0 || telphone=='' || deladdr=='' || e=='' || econf=='') {
		alert('You have not filled in all the required fields!' + lf);
		return;
		}
	// UK country needs postcode
	if (countryind==1) {
		var newpcode=checkPostCode(pcode,'UK');
		if (newpcode==false) {
			alert('That postcode does not appear to be valid!' + lf);
			return;
			}
		d.postcode.value=newpcode;
		}
	if (e!=econf) {
		alert('Your e-mail addresses do not match!' + lf);
		return;
		}
	if (NoOfChars(e,"@") != 1 || NoOfChars(econf,".") < 1) {
		alert('That e-mail address does not appear to be valid!' + lf);
		return;
		}
	d.submit();
}