function validate(){
var f = parent.document.form;
if(f.name.value.length<1){
    alert("Por favor preencha seu nome");
    f.name.focus();
    return false;
}  
if (!isValidEmailAddress(f.email_address.value)) {
    alert("Por favor verifique seu email");
    f.email_address.focus();
    return false;
}  
return true;  
}
function isValidEmailAddress(addr) {
    var re;
    re = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,})+$/;
    if (re.test(addr) == true)
       return true;
    else
      return false;
}