function checkMail(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 validaForm(form)
{
    for (i=0;i<form.length;i++)
    {
        if ((form[i].value == "") || (form[i].value.substring(0,1)==" "))
        {
            var nome = form[i].name;
            alert("Favor preencher todos os campos");
            form[i].select();
            form[i].focus();
            return false;
        }//if
    }//for
    if(!checkMail(document.getElementById('email').value))
    {
        alert("Digite um endereco de e-mail valido");
        document.getElementById('email').value = "";
        document.getElementById('email').focus();
        return false;
    }

    return false;
    
}//function

function validaFormilho(form)
{

    for (i=0;i<form.length;i++)
    {
        if ((form[i].value == "") || (form[i].value.substring(0,1)==" "))
        {
            var nome = form[i].name;
            //alert(nome);
            alert('Favor preencher todos os campos!');
            //form[i].select();
            form[i].focus();
            return false;
        }//if
    }//for
    if(!checkMail(document.getElementById('email').value))
    {
        alert("Digite um endereço de e-mail valido");
        document.getElementById('email').value = "";
        document.getElementById('email').focus();
        return false;
    }
    //alert("PQ sai??");
    return true;
}//function

function apareceLogin()
{
    document.getElementById('formulario_de_login').style.display ='block';

    document.getElementById('menu_do_topo').style.display ='none';
    return false;
}

function apareceMenu()
{
    document.getElementById('formulario_de_login').style.display ='none';
    document.getElementById('menu_do_topo').style.display ='block';
    return false;
}

   function escolhe()
    {
        if(navigator.appName.indexOf('Internet Explorer')>0)
        {
           document.getElementById("bhie").style.display =  'block';
        }
        else
        {
            document.getElementById("bhff").style.display= 'block';
        }

    }