//Copyright by Konrad Grochowski
var obj

function zmienOpac(ido,opacity) { 
    var object = document.getElementById(ido).style; 
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
    object.filter = "alpha(opacity=" + opacity + ")"; 
}

function podswietl(ido,opacity) {
 opacity+=5
    if(opacity<=100) {
    zmienOpac(ido,opacity)
    setTimeout("podswietl('"+ido+"',"+opacity+")",20)
    }
  }


function przyciemnij(ido,opacity) {
 opacity-=5
    if(opacity>=50) {
    zmienOpac(ido,opacity)
    setTimeout("przyciemnij('"+ido+"',"+opacity+")",20)
    }
  }