function doBlink () 
{
   var blink = document.all.tags ("BLINK");
   for (var i=0; i < blink.length; i++)
      blink[i].style.visibility = blink[i].style.visibility == "" ? "hidden" : ""; 
}

function startBlink () 
{
  if (document.all)
    setInterval ("doBlink ()", 500)
}            

function act_pvp ()
{
   document.formulario.act_precio.value='si';
   document.formulario.submit ();
}

function mostrarEspera (flag)
{
   document.getElementById('trListado').style.display = 'none';
   document.getElementById('trEspera').style.display = 'block';	    
   setTimeout ('quitarEspera ('+flag+')', 1500);
}

function quitarEspera (flag)
{
   if (flag)
   {
      document.getElementById('trListado').style.display = 'block';
      document.getElementById('trEspera').style.display = 'none';
   }
}         

function Teclado (evento)
{
   if (window.event.keyCode==13)
      anyadir ();
}