function checkemail(str) {
	var filter =/^\w+[\+\.\w-]*@([\w-]+\.)*\w+[\w-]*\.([a-z]{2,7}|\d+)$/i;
	return (filter.test(str));
}

function validateFields() {
	if (document.form1.name.value=='') {
		alert('Please enter your name.');
		document.form1.name.focus();
		return;
	}
	else if (document.form1.email.value=='') {
		alert('Please enter your email address.');
		document.form1.email.focus();
		return;
	}
	else if (!checkemail(document.form1.email.value)) {	
		alert('Please enter a valid email address.');
		document.form1.email.focus();
		return;
	}
	else if (document.form1.message.value=='') {
		alert('Please enter your message.');
		document.form1.message.focus();
		return;
	}
	document.form1.submit();
}