function clear_form() {
    formObject = document.getElementById('newsletter_form');
    inputs = formObject.getElementsByTagName('input');
    for(i=0; i<inputs.length; i++) {
        if(inputs[i].className != 'checkbox')
            inputs[i].value = '';
    }
    textareas = formObject.getElementsByTagName('textarea');
    for(i=0; i<textareas.length; i++) {
        textareas[i].value = '';
    }
    inputs[0].focus();
}

function submit_form() {
    formObject = document.getElementById('newsletter_form');
    inputs = formObject.getElementsByTagName('input');
    if(inputs[0].value == '') {
        alert('Please enter your name');
        inputs[0].focus();
        return false;
    }
    if(inputs[1].value == '') {
        alert('Please enter your email address');
        inputs[1].focus();
        return false;
    }
    textareas = formObject.getElementsByTagName('textarea');
    if(textareas[0].value == '') {
        alert('Please enter your enquiry');
        textareas[0].focus();
        return false;
    }
    return true;
}