var req;function validarDados(campo,valor){if(window.XMLHttpRequest){req=new XMLHttpRequest();}else if(window.ActiveXObject){req=new ActiveXObject("Microsoft.XMLHTTP");}var url="ajax/validacao.php?campo="+campo+"&valor="+valor;req.open("Get",url,true);req.onreadystatechange=function(){if(req.readyState==1){document.getElementById('campo_'+campo+'').innerHTML='<font color="gray">Verificando...</font>';}if(req.readyState==4&&req.status==200){var resposta=req.responseText;document.getElementById('campo_'+campo+'').innerHTML=resposta;}}req.send(null);}