function validate_form()
{
	valid = true;

        if (document.request_itinerary.firstname.value == "")
        {
            alert ("Please enter your First Name");
            valid = false;
        }
		if (document.request_itinerary.surname.value == "")
        {
            alert ("Please enter your Surname");
            valid = false;
        }
		if (document.request_itinerary.email.value == "")
        {
            alert ("Please enter your Email Address");
            valid = false;
        }
		if (document.request_itinerary.telephone.value == "")
        {
            alert ("Please enter your Telephone Number");
            valid = false;
        }
		if (document.request_itinerary.location.value == "")
        {
            alert ("Please let us know your location");
            valid = false;
        }		
		
        return valid;
}