function validateForm(form) {
	if (form.first_name.value == "") {
		alert("Please enter your first name.");
		form.first_name.focus();
		return false;
	}
	if (form.last_name.value == "") {
		alert("Please enter your last name.");
		form.last_name.focus();
		return false;
	}
	if (form.organization.value == "") {
		alert("Please enter the name of your organization.");
		form.organization.focus();
		return false;
	}
	if (form.position.value == "") {
		alert("Please enter your position.");
		form.position.focus();
		return false;
	}
	if (form.email.value == "") {
		alert("Please enter your email address.");
		form.email.focus();
		return false;
	}
	if (!checkEmail(form.email.value)) {
		alert("Please enter a valid email address.");
		form.email.focus();
		return false;
	}
}