function bases(action)
{
action_bases(action);
}

function biblio(action)
{
action_biblio(action);
}

function action_biblio(visib)
{
xGetElementById(biblio_txt).style.visibility=visib;
xGetElementById(biblio_texto).style.visibility=visib;
xGetElementById(cerrar1).style.visibility=visib;
}

function action_bases(visib)
{
xGetElementById(bases_txt).style.visibility=visib;
xGetElementById(bases_txt1).style.visibility=visib;
xGetElementById(cerrar).style.visibility=visib;
}

function xGetElementById(e) {
  if(typeof(e)!='string') return e;
  if(document.getElementById) e=document.getElementById(e);
  else if(document.all) e=document.all[e];
  else e=null;
  return e;
}