function validate() {
    //alert(this);
    form = document.getElementById('contact_form');

    var message;

    for (var i=0; i<4; i++) {
        if (form[i].value == "") {
            form[i].style.borderColor="#ff0000";
            message = true;
        } else {
            form[i].style.borderColor="#006AA5";
        }
    }

    if (message == true) {
        alert('Please complete the highlighted fields.');
        return false;
    } else {
        form['check_values'].value = true;
        return true;
    }
}