function valida(obj)
{

	if (obj.elements['name'].value == '')
	{
		alert('Preencha o campo nome.');
		obj.elements['name'].focus();
		return false;
	}
	
	if (obj.elements['email'].value == "") {
		alert('Preencha o campo email.');
		obj.elements['email'].focus();
		return false;
	}
	if (obj.elements['email'].value.indexOf("@") == -1) {
		alert('Preencha o campo E-mail.');
		obj.elements['email'].focus();
		return false;
	}
	
		
	return true;

}