function validateForm(formobj) {
 if (formobj.name.value == '') {
                alert('Please enter your name.');
                formobj.name.focus();
                return false;
        }
        if (formobj.email.value == '') {
                alert('Please enter your email.');
                formobj.email.focus();
                return false;
        }

        if (formobj.subject.value == '') {
                alert('Please enter a subject.');
                formobj.subject.focus();
                return false;
        }
        if (formobj.message.value == '') {
                alert('Please enter a message.');
                formobj.message.focus();
                return false;
        }
        return true;
}