function enabledElement(element,value) {
    if (value) {
        element.removeAttribute('disabled');
    } else {
        element.setAttribute('disabled','true');
    }
}

function submitContactForm(form, type) {
    var url = 'ContactForm?type=' + type + '&submit=true';
    var msg = '';

    if (form.firstname.value == '') {
        msg += 'First Name is required<br>';
    }
    if (form.lastname.value == '') {
        msg += 'Last Name is required<br>';
    }
        
    if (msg != '') {
        url += '&invalid=' + msg;
    }
    loadPage(url,$('content'),true);
}

function validateContactForm(form) {
    if (form.firstname.value == '') {
        enabledElement(form.send,false);
    } else {
        enabledElement(form.send,true);
    }
}