var graphics = new Array ();
var countGraph = 0, prevID = 0, prev1 = -1, prev2 = -1;

function CreateGraph (nameGraph, width, height)
{
  if ( SupportDHTML ())
  {
    this.image = new Image ();
    this.image.src = "images/" + nameGraph;
    this.image.width = width;
    this.image.height = height;
  } // if
}

function AddGraph (nameGraph, width, height)
{
  graphics [countGraph] = new CreateGraph (nameGraph, width, height);
  countGraph++;
}

function CountGraph ()
{
  return countGraph;
}

function OnSelectImg(ID)
{
  if (ID < 0 || ID > countGraph)
  {
    do
    {
      ID = Math.floor (Math.random () * countGraph);
    } while (ID == prevID);
  } // if
  prev2 = prev1;
  prev1 = prevID;
  prevID = ID;
  if (SupportDHTML ())
  {
    var e;
    e = window.event.srcElement;
    if (e.tagName == "IMG")
    {
      e.src = graphics [ID].image.src;
      e.width = graphics [ID].image.width;
      e.height = graphics [ID].image.height;
    } // if

    if (prev1 >= 0)
    {
      if (table1.style.visibility != "visible")
        table1.style.visibility="visible";
      fig1.src = graphics [prev1].image.src;
      fig1.width = graphics [prev1].image.width;
      fig1.height = graphics [prev1].image.height;
    } // if

    if (prev2 >= 0 && countGraph > 2)
    {
      if (table2.style.visibility != "visible")
        table2.style.visibility="visible";
      fig2.src = graphics [prev2].image.src;
      fig2.width = graphics [prev2].image.width;
      fig2.height = graphics [prev2].image.height;
    } // if
  } // if
}