function billboardx()
{
  cop = document.getElementById("i").style.opacity;
  document.getElementById("opdisplay").innerHTML = "OPACITY";
  if (cop == 1.00)
  { 
    // FLIP TO NEXT IMAGE
    imp = document.getElementById("i").src;
    impstr = "" + imp + "";
    inum = impstr.substr(-6);
    inb = parseInt(inum.substr(1,1));
    document.getElementById("bbstage").style.backgroundImage = "url('" + impstr + "')";
    document.getElementById("i").style.opacity = 0;
    inb++;
    if (inb == 3)
    {
      inb = 1;
    }
    nimp = "http://www.appligent.com/files/billboardtest/a" + inb + ".jpg";
    nmap = "#map" + inb;
    document.getElementById("i").src = nimp;
    document.getElementById("i").useMap = nmap;
  }
  else
  { 
    // JUST INCREASE OPACITY
    oldop = parseFloat(cop);
    upop = oldop + 0.1; //025;
    //upt = upop;
    document.getElementById("i").style.opacity = upop;
     x++;
  }
}

var x = 0;
setInterval("billboardx()", 50);