function validate_contato(form) {
var name = form.nome.value;
var email = form.email.value;
var texto = document.getElementById('texto').value;

if(name == "" || name=="Nome") { document.getElementById('nome').style.background = '#ccc';
return false;}
if(email == "") { document.getElementById('email').style.background = '#ccc'; return false;}  
if(texto == "") {  document.getElementById('texto').style.background = '#ccc';return false;}    
return true;
}