function validate_required(field) {
	with (field){
		if (value==null||value=="") {
			return false;
		}
		else {
			return true;
		}
	}
}

function validate_form(thisform) {
	with (thisform) {
		if (validate_required(firstname)==false) {
			alert("\"First Name\" must be filled out.");
			firstname.focus();
			return false;
		}
		else if (validate_required(lastname)==false) {
			alert("\"Last Name\" must be filled out.");
			lastname.focus();
			return false;
		}
		else if (validate_required(city)==false) {
			alert("\"City, State\" must be filled out.");
			city.focus();
			return false;
		}
		else if (validate_required(email)==false) {
			alert("\"Email\" must be filled out.");
			email.focus();
			return false;
		}
		else if (validate_required(how)==false) {
			alert("\"How did you find us?\" must be filled out.");
			how.focus();
			return false;
		}
	}
}