// JavaScript Document
function pulaCampo(obj,len,campo) { 
   if (obj.value.length == len) { 
       document.getElementById(campo).focus(); 
     } 
 } 

function formatar(src, mask) 
{
var i = src.value.length;
var saida = mask.substring(0,1);
var texto = mask.substring(i);

var carCode = event.keyCode; 

if((carCode < 48) || (carCode > 57)) {
  alert("Digite somente números!");
  event.cancelBubble = true;
  event.returnValue = false;
  }
else
if (texto.substring(0,1) != saida) 
{
src.value += texto.substring(0,1);
}
}
function pula(maxlength,id,proximo){ 
   if(document.getElementById(id).value.length>=maxlength){ 
     document.getElementById(proximo).focus(); 
  } 
}