function checkdetails() {
	var d=document.forms[0];
	var fullname=d.txtname.value;
	var email=d.txtemail.value;
	var email1=d.txtemailconf.value;
	var pcode=d.txtpostcode.value;
	if (fullname==''||email==''||email1==''||pcode=='') {
		alert('You have not filled in all requuired fields (Name, email & postcode) - please retry!');
		return;
	}
	if (NoOfChars(email,"@") != 1 || NoOfChars(email,".") < 1) {
		alert('That e-mail address does not appear to be valid.  Please check and retry!');
		return;
		}
	if (email!=email1) {
		alert('Your e-mail addresses do not match. Please retry!');
		return;
	}
	d.submit();
}