function fixElement(element, message) 
{
alert(message);
element.focus();
}

function validateField(form) {
	
    var form = document.forms['captureForm'];
    
    if (form.fullname.value == "") {
    fixElement(form.fullname, "Please include your full name.");
	return false;
    }
    else if (form.address.value =="") {
    fixElement(form.address, "Please include your address.");
	return false;
    }
    else if (form.postcode.value =="") {
    fixElement(form.postcode, "Please include your postcode.");
	return false;
    }
    else if (form.telephone.value =="") {
    fixElement(form.telephone, "Please include your telephone number.");
	return false;
    }
    else
    {
	return true;
    }
}