function checkform(){
 
    if (document.enquiry.marketing.value=='') {
        rc=alert('Your feedback is important to us. Please choose an option which tells us how you found us.');
        return false;
    }
	if (document.enquiry.name.value=='') {
        rc=alert('Your Name is required.');
        return false;
    }
    if (document.enquiry.address.value=='') {
        rc=alert('Your Address is required.');
        return false;

    }
    if (document.enquiry.postcode.value=='') {
        rc=alert('Your Post Code is required.');
        return false;
    }
    if (document.enquiry.telephone.value=='') {
        rc=alert('Your Telephone No. is required.');
        return false;
    }
    if (document.enquiry.email.value.indexOf('@')==-1) {
        rc=alert('Your E-mail Address is required.');
        return false;
    }
     
    return true;
}