function isMail(mail) {
    var er = new RegExp(/^[A-Za-z0-9_\-\.]+@[A-Za-z0-9_\-\.]{2,}\.[A-Za-z0-9]{2,}(\.[A-Za-z0-9])?/);
    if (typeof (mail) == "string") {
        if (er.test(mail)) { return true; }
    } else if (typeof (mail) == "object") {
        if (er.test(mail.value)) {
            return true;
        }
    } else {
        return false;
    }
}

function addFav(){
    var url      = "http://www.solibras.com.br";
    var title    = "Solibras - Sistema Escolar";
    if (window.sidebar) window.sidebar.addPanel(title, url,"");
    else if(window.opera && window.print){
        var mbm = document.createElement('a');
        mbm.setAttribute('rel','sidebar');
        mbm.setAttribute('href',url);
        mbm.setAttribute('title',title);
        mbm.click();
    }
    else if(document.all){window.external.AddFavorite(url, title);}
}