function CheckContactForm() {

	if(document.ContactForm.sendername.value == '') {
		alert('Please enter your name.');
		document.ContactForm.sendername.focus();
		return false;
	}

	if(document.ContactForm.email_address.value == '') {
		alert('Please enter your email address.');
		document.ContactForm.email_address.focus();
		return false;
	}

	email_valid = new RegExp(/^.+@.+\..{2,3}$/);

	if(! email_valid.test(document.ContactForm.email_address.value)) {
		alert("The email address you entered is invalid.");
		document.ContactForm.email_address.focus();
		return false;
	}

	if(document.ContactForm.enquiry.value == '') {
		alert("Please state the nature of your enquiry.");
		document.ContactForm.enquiry.focus();
		return false;
	}

	return true;
}