var _keepAlive={
 interval:false,
 confirmMsg:'Su sesión está a punto de caducar. ¿Quiere actualizarla?',
 keepAlive:function(){
  if(confirm(this.confirmMsg))
   document.forms.frm_thisisaplaystationblackdisk.submit();
  else
   top.open('http://www.aireuropa.com','_top');
 },
 stop:function(){
  if(this.interval){
   clearInterval(this.interval);
   this.interval=false;
  }
 },
 start:function(){
  return;
  if(!document.forms.frm_thisisaplaystationblackdisk){
   var t=document.createElement('DIV');
   t.style.display='none';
   document.body.appendChild(t);
   t.innerHTML='<form name="frm_this" target="ifr_this" action="/web9/web9_web/1/comunes/xsesion.info_ses.html" method="post"></form><iframe name="ifr_this" src="/web9/blanco.html"></iframe>'.replace(/this/g,'thisisaplaystationblackdisk');
  }
  this.stop();
  this.interval=setInterval("_keepAlive.keepAlive()",480000); // Cada 8 min.
 }
};