function ValidateForm(f){

with(f){
if (isEmpty(form_first_name.value)) {
alert("Please enter your First Name");
form_first_name.focus();
return false;
}

if (isEmpty(form_family_name.value)) {
alert("Please enter your Family Name");
form_family_name.focus();
return false;
}

if (isEmpty(form_address.value)) {
alert("Please enter your Address");
form_address.focus();
return false;
}

if (isEmpty(form_postcode.value)) {
alert("Please enter your Postcode");
form_postcode.focus();
return false;
}

if (isEmpty(form_telephone.value)) {
alert("Please enter your Telephone Number");
form_telephone.focus();
return false;
}

}
return true;
}