function obj(name_)
{
  this.name = name_;
}

function random_idx(max)
{
  var idx = Math.floor(Math.random() * max);
  return idx;
}

function put_img(imgs, links, idx)
{
  var tag = "<a href=\"" + links[idx].name + "\"><img border=\"0\" src=\"" + imgs[idx].name + "\"></a>";
  return tag;
}

function put_iframe()
{
  var tag = "<iframe src=\"\" frameborder=\"no\" height=\"100\" width=\"171\"";
  tag += " scrolling=\"no\" vspace=\"0\" hspace=\"0\"";
  tag += " marginwidth=\"0\" marginheight=\"0\" name=\"marquee_descr\">";
  tag += "<p class=\"marquee_descr\">";
  tag += "With an update version of browser such as Mozilla, you are able to see the description of the image here.";
  tag += "</p></iframe>";
  return tag;
}

function filename(files, idx)
{
  var name = files[idx].name;
  return name;
}

var marq_img = new Array();
marq_img[0] = new obj("images/marq_agn.gif");
marq_img[1] = new obj("images/marq_binpulsar.gif");
marq_img[2] = new obj("images/marq_magturb.gif");
marq_img[3] = new obj("images/marq_gravwave.gif");
marq_img[4] = new obj("images/marq_balloon.gif");
marq_img[5] = new obj("images/marq_galwind.gif");
marq_img[6] = new obj("images/marq_cdm.gif");
marq_img[7] = new obj("images/marq_reionization.gif");

var marq_txt = new Array();
marq_txt[0] = new obj("marq_agn.html");
marq_txt[1] = new obj("marq_binpulsar.html");
marq_txt[2] = new obj("marq_magturb.html");
marq_txt[3] = new obj("marq_gravwave.html");
marq_txt[4] = new obj("marq_balloon.html");
marq_txt[5] = new obj("marq_galwind.html");
marq_txt[6] = new obj("marq_cdm.html");
marq_txt[7] = new obj("marq_reionization.html");

var gal_link = new Array();
gal_link[0] = new obj("gal_agn.html");
gal_link[1] = new obj("gal_binpulsar.html");
gal_link[2] = new obj("gal_magturb.html");
gal_link[3] = new obj("gal_gravwave.html");
gal_link[4] = new obj("gal_balloon.html");
gal_link[5] = new obj("gal_galwind.html");
gal_link[6] = new obj("gal_cdm.html");
gal_link[7] = new obj("gal_reionization.html");

var marq_max = 8;