function form_validate()
{
	if (document.form_enquiry.surname.value == '')
	{
		alert('Please enter your surname');
		document.form_enquiry.surname.focus();
		return false;
	}

	if (document.form_enquiry.email.value == '' && document.form_enquiry.tel_home.value == '' && document.form_enquiry.tel_work.value == '' && document.form_enquiry.tel_mobile.value == '')
	{
		alert('Please enter your e-mail address or a telephone number');
		document.form_enquiry.tel_home.focus();
		return false;
	}

	if (!document.form_enquiry.tob.checked)
	{
		alert('Please confirm that you have read our terms and conditions');
		document.form_enquiry.tob.focus();
		return false;
	}

	return true;
}