window.addEvent('domready',add_events);

function add_events()
{
    newsletter = $('newsletter_mail');
    txtNewsletter = "votre email";
    newsletter.value = txtNewsletter;
    newsletter.addEvents({
        'focus': focusNewsletter.bindWithEvent(newsletter),
        'blur': blurNewsletter.bindWithEvent(newsletter)
    });
}

function focusNewsletter(elmt)
{
    if(this.value == txtNewsletter);
        this.value = '';
}

function blurNewsletter(elmt)
{
    if(this.value == '');
        this.value = txtNewsletter;
}