var speed = 10;
var transition = 10;
var timer= 0;
var opaciT = 100;

function opacity()
{
    opaciT = opaciT - transition;

    var object = document.getElementById("pl").style;
    object.opacity = (opaciT / 100);
    object.MozOpacity = (opaciT / 100);
    object.KhtmlOpacity = (opaciT / 100);
    object.filter = "alpha(opacity=" + opaciT + ")";
     
     if (opaciT <= 0)
     {
          document.getElementById("pl").style.visibility="hidden";
          clearInterval(timer);
     }

}
 
function preload()
{
     if (document.getElementById)
     {
          timer = setInterval("opacity()",speed);
     }
     
     else
     {
          if (document.layers)
          {
               timer = setInterval("opacity()",speed);
          }
             else
          {
               timer = setInterval("opacity()",speed);
          }
     }
}

window.onload = function() { preload(); }