var DP = {
  ds: '',
  dA: 0,
  sD: 0,
  tD: 0,
  t: 4000,
  idD: 'diapositivas',
  nID: 'diapos-on',
  IE: false,
  anim: true,
  intv: '',
  lnz: '',
  $: function(el){var e = document.getElementById(el);return e;},
  op: function(el,v){(DP.IE) ? el.style.filter='alpha(opacity='+v+')' : el.setAttribute('style','opacity:'+v/100);}, 
  fun: function(){
    var i = 100;
    (DP.dA==DP.tD) ? DP.sD = 0 : DP.sD = DP.dA+1;
    DP.intv = setInterval(function(){
      i = i-5;
      if(i>=0){
        DP.op(DP.ds[DP.dA],i);
        DP.op(DP.ds[DP.sD],(100-i));
      } else {
        (DP.dA==DP.tD) ? DP.dA = 0 : DP.dA++;
        clearInterval(DP.intv);
        if(DP.anim){DP.lnz = setTimeout(DP.fun,DP.t);}
      }
    },50);
  },
  inicio: function(){
    (navigator.userAgent.match('MSIE')) ? DP.IE = true : DP.IE = false;
    DP.$(DP.idD).id=DP.nID;
    DP.ds = DP.$(DP.nID).getElementsByTagName('li');
    DP.tD = DP.ds.length-1;
    for(var i=0;i<=DP.tD;i++){DP.op(DP.ds[i],0);}
    DP.op(DP.ds[0],100);
    DP.lnz = setTimeout(DP.fun,DP.t);
  }  
}