var Inzeraty = ["inzerat-1", "inzerat-2"];
var Inzer = 0;

function InicializaceInzeratu(){
  r = Math.round(Math.random()*2);
  Inzer += r;
  VymenaInzeratu();
}

function VymenaInzeratu(){
  Inzer++;
  document.getElementById(Inzeraty[Inzer%2]).style.display = "none";
  document.getElementById(Inzeraty[(Inzer+1)%2]).style.display = "block";
  ZesvetleniInzeratu(16);
  interval = setTimeout("VymenaInzeratu()", 10000);
}

function ZesvetleniInzeratu(a){
  barvy = ["#FFFFFF", "#FDFDFD", "#FBFBFB", "#F9F9F9", "#F7F7F7", "#F5F5F5", "#F3F3F3", "#F1F1F1", "#EFEFEF", "#EDEDED", "#EBEBEB", "#E9E9E9", "#E7E7E7", "#E5E5E5", "#E3E3E3", "#E1E1E1", "#DFDFDF", "#DBDBDB", "#D8D8D8", "#CCCCCC", "#BBBBBB", "#AAAAAA", "#999999"]
  document.getElementById(Inzeraty[(Inzer+1)%2]).style.backgroundColor = barvy[a];
  if(a){
    inte = setTimeout("ZesvetleniInzeratu("+(a-1)+")", 100);
  }
}
//InicializaceInzeratu();