function validate_reservation( ) {

    var error_string = '';

    if ( document.reserve.Firstname.value == "" )  {
		error_string = error_string + 'Please enter your first name\n\n';}
		
    if ( document.reserve.Lastname.value == "" )  {
		error_string = error_string + 'Please enter your surname\n\n';}
		
    if ( document.reserve.State.value == "" )  {
		error_string = error_string + 'Please enter your Province / State\n\n';}
		
	if (document.reserve.Email.value == "") {
		error_string = error_string + 'Please supply your email address\n\n';}
		
	if (document.reserve.Email.value != "")  {
	   if ((document.reserve.Email.value.indexOf("@") < 1) || (document.reserve.Email.value.charAt(document.reserve.Email.value.length-1)=="@"))
 error_string = error_string + 'Your email address is invalid\n\n';} 
 
    if ( document.reserve.Zip.value == "" )  {
		error_string = error_string + 'Please enter your postcode / zipcode\n\n';}

	if (error_string == '') {return true;}
	else {
		alert(error_string);
		return false;
		}
	}