var aryImages = new Array(9);

    aryImages[0] = "img/DUNAS-cero_hab.gif";
	aryImages[1] = "img/DUNAS-fra_lit.gif";
	aryImages[2] = "img/DUNAS-dun_mov.gif";
	aryImages[3] = "img/DUNAS-hoy_int.gif";
	aryImages[4] = "img/DUNAS-enc_bos.gif";
	aryImages[5] = "img/DUNAS-dun_fij.gif";
	aryImages[6] = "img/DUNAS-enc_haj.gif";
	aryImages[7] = "img/DUNAS-ter_rem.gif";
	aryImages[8] = "img/DUNAS-hum_cha.gif";
	aryImages[9] = "img/DUNAS-ter_sed.gif";
	aryImages[10] = "img/DUNAS-var_sed.gif";


  for (i=0; i < aryImages.length; i++) {
    var preload = new Image();
    preload.src = aryImages[i];
  }

  function swap(imgIndex, imgTarget) {
    document[imgTarget].src = aryImages[imgIndex];
  }