function emailCheck(el) {
	var emailStr = el;
	var emailPat = /^[\'_\.0-9A-Za-z-]+@([0-9A-Za-z-]+[0-9A-Za-z-\.]+)\.([A-Za-z]){2,4}$/;
	var email = emailStr.toLowerCase();
	var matchArray = email.match(emailPat);
	if (matchArray==null) {
		return false;
	}
	return true;
}

function validateContact() {
	document.getElementById('yourName').className = '';
	document.getElementById('yourEmail').className = '';
	document.getElementById('yourTelephone').className = '';
	document.getElementById('yourEnquiry').className = '';	
	if (document.getElementById('yourName').value == '') {
		alert('Please enter your name');
		document.getElementById('yourName').className = 'error';
		document.getElementById('yourName').focus();
		return false;
	} else if (document.getElementById('yourEmail').value == '') {
		alert('Please enter your email address');
		document.getElementById('yourEmail').className = 'error';
		document.getElementById('yourEmail').focus();
		return false;
	} else if (emailCheck(document.getElementById('yourEmail').value) == false) {
		alert('Please enter a valid email address');
		document.getElementById('yourEmail').className = 'error';
		document.getElementById('yourEmail').focus();
		return false;
	} else if (document.getElementById('yourTelephone').value == '') {
		alert('Please enter your telephone number');
		document.getElementById('yourTelephone').className = 'error';
		document.getElementById('yourTelephone').focus();
		return false;
	} else if (document.getElementById('yourEnquiry').value == '') {
		alert('Please enter your enquiry')
		document.getElementById('yourEnquiry').className = 'error';;
		document.getElementById('yourEnquiry').focus();
		return false;
	}
	return true;
}