var opacity = 0;

function hideImage(o){
   opacity = o - 0.02;
   alphaOpacity = opacity * 100;
   /*zmena pruhlednosti obrazku*/
   document.getElementById("ss").style.opacity = opacity;
   document.getElementById("ss").style.filter = 'alpha(opacity=' + alphaOpacity + ')';
   
   if (opacity < 0){
      //setTimeout('hideImage(opacity)');
      changeImage();
      
   }
   else
      setTimeout('hideImage(opacity)', 30);
}
function changeImage(){
   imageUrl = document.images["ss"].src;
   parts = imageUrl.split("/");
   namePosition = parts.length-1;
   imageSrc = parts[namePosition];

   /*vybere nektery z obrazku - kontroluje zda nebyl vybran prave zobrazeny*/
   do{
      /*nahodny vyber obrazku*/
      newImage = Math.floor(Math.random()*imageList.length);
      imageUrl = imageList[newImage];
      parts = imageUrl.split("/");
      namePosition = parts.length-1;
      newImageSrc = parts[namePosition];
      
   }
   while (imageSrc == newImageSrc)
   
   /*nahradi puvodni obrazek*/
   document.images["ss"].src = imageList[newImage];

   /*zavola fci pro plynule zobrazeni*/
   setTimeout('showImage(0)', 200);
}

function showImage(o){
   opacity = o - (-0.02);
   alphaOpacity  = opacity * 100;
   /*zmena pruhlednosti obrazku*/
   document.images["ss"].style.opacity = opacity;
   document.images["ss"].style.filter = 'alpha(opacity=' + alphaOpacity + ')';
   
   if (opacity >= 1)
      setTimeout('hideImage(1)', 3000);
   else
      setTimeout('showImage(opacity)', 30);
   
}