function formSubmit() {
        var ret1 = validate('firstName');
        var ret2 = validate('lastName');
        var ret3 = validate('phone');
        return (ret1 && ret2 && ret3);
}

function validate(elementName) {
        var element = document.getElementById(elementName);

        if (element.value == "") {
		        alert(elementName + " is required");
            element.focus();
            return false;
        }
        return true;
}