function checkContactus(nform) {
	if (nform.email.value=='') {
		alert('Please input your email address.'); nform.email.focus(); return false;
	}
	if (nform.subject.value=='') {
		alert('Please input a subject.'); nform.subject.focus(); return false;
	}
	if (nform.message.value=='') {
		alert('Please tell fill the description field.'); nform.message.focus(); return false;
	}
	return true;
}
function submitContactus() {
	if (checkContactus(document.contactus)==true) {
		document.contactus.submit();
	}
}