function foco(objID) {
    document.getElementById(objID).focus();
  }

  function escribe(donde, txt){
    document.getElementById(donde).innerText = txt;
  }

  function limpiaCaja(txt, caja, click) {
	que = document.getElementById(caja);
	if (click) {
      if (que.value == txt)
	    que.value = "";
	}else{
      if (que.value == "")
	    que.value = txt;
	}
  }

  function inscribe(cajaMail, txt) {
    mail = document.getElementById(cajaMail).value;
    window.open('newsletter.php?email='+ mail ,'newsletter','left=300,top=200,width=400,height=250,toolbar=0,resizable=0');
    document.getElementById(cajaMail).value = txt;
  }