// Browser Slide-Show script. With image cross fade effect for those browsers
// that support it.
// Script copyright (C) 2004-2008 www.cryer.co.uk.
// Script is free to use provided this copyright header is included.
var FadeDurationMS=3000;
function SetOpacity(object,opacityPct)
{
  // IE.
  object.style.filter = 'alpha(opacity=' + opacityPct + ')';
  // Old mozilla and firefox
  object.style.MozOpacity = opacityPct/100;
  // Everything else.
  object.style.opacity = opacityPct/100;
}
function ChangeOpacity(id,msDuration,msStart,fromO,toO)
{
  var element=document.getElementById(id);
  var msNow = (new Date()).getTime();
  var opacity = fromO + (toO - fromO) * (msNow - msStart) / msDuration;
  if (opacity>=100)
  {
    SetOpacity(element,100);
    element.timer = undefined;
  }
  else if (opacity<=0)
  {
    SetOpacity(element,0);
    element.timer = undefined;
  }
  else 
  {
    SetOpacity(element,opacity);
    element.timer = window.setTimeout("ChangeOpacity('" + id + "'," + msDuration + "," + msStart + "," + fromO + "," + toO + ")",8);
  }
}
function FadeInImage(foregroundID,newImage,backgroundID)
{
  var foreground=document.getElementById(foregroundID);
  if (foreground.timer) window.clearTimeout(foreground.timer);
  if (backgroundID)
  {
    var background=document.getElementById(backgroundID);
    if (background)
    {
      if (background.src)
      {
        foreground.src = background.src; 
        SetOpacity(foreground,100);
      }
      background.src = newImage;
      background.style.backgroundImage = 'url(' + newImage + ')';
      background.style.backgroundRepeat = 'no-repeat';
      var startMS = (new Date()).getTime();
      foreground.timer = window.setTimeout("ChangeOpacity('" + foregroundID + "'," + FadeDurationMS + "," + startMS + ",100,0)",8);
    }
  } else {
    foreground.src = newImage;
  }
}

var slideCache = new Array();
var mytimeout = null;
var myconter = 1;

function stopSlide(img,pc)
{
	clearTimeout(mytimeout);
	mytimeout = 0;
	slideCache = null;
	var slideCache = new Array();
	myconter = 1;

	document.getElementById('flash_item_1').src='/images/flash_home_item_1_off.gif';
	document.getElementById('flash_item_2').src='/images/flash_home_item_2_off.gif';
	document.getElementById('flash_item_3').src='/images/flash_home_item_3_off.gif';		

	document.getElementById('flash_item_'+pc).src='/images/flash_home_item_'+pc+'_on.gif';
	document.getElementById('altSlideShow').src=img;
	document.getElementById('altSlideShowBG').style.display='block';

	mytimeout = setTimeout("document.getElementById('altSlideShowBG').style.display='none';RunSlideShow('SlidePicture','SlidePictureBackground','/flash/setri_hra.jpg;/flash/prasatko.jpg;/flash/spo.jpg',3);document.getElementById('flash_item_"+pc+"').src='/images/flash_home_item_"+pc+"_off.gif';", 3*1500);
}

function RunSlideShow(pictureID,backgroundID,imageFiles,displaySecs)
{
  var imageSeparator = imageFiles.indexOf(";");
  var nextImage = imageFiles.substring(0,imageSeparator);

  if (slideCache[nextImage] && slideCache[nextImage].loaded)
  {
    FadeInImage(pictureID,nextImage,backgroundID);
    var futureImages = imageFiles.substring(imageSeparator+1,imageFiles.length)
      + ';' + nextImage;      
    mytimeout = setTimeout("RunSlideShow('"+pictureID+"','"+backgroundID+"','"+futureImages+"',"+displaySecs+")", displaySecs*1500);

	if (myconter > 1)
		document.getElementById('flash_item_'+(myconter-1)).src='/images/flash_home_item_'+(myconter-1)+'_off.gif';
	else
		document.getElementById('flash_item_3').src='/images/flash_home_item_3_off.gif';
	document.getElementById('flash_item_'+myconter).src='/images/flash_home_item_'+myconter+'_on.gif';
	if(myconter >= 3)
		myconter = 1;
	else
		myconter = myconter+1; 

    // Identify the next image to cache.
    imageSeparator = futureImages.indexOf(";");			
		nextImage = futureImages.substring(0,imageSeparator);
  } else {
    mytimeout = setTimeout("RunSlideShow('"+pictureID+"','"+backgroundID+"','"+imageFiles+"',"+displaySecs+")", 20);
  }
  
 
  
  // Cache the next image to improve performance.


  if (slideCache[nextImage] == null)
  {
    slideCache[nextImage] = new Image;
    slideCache[nextImage].loaded = false;
    slideCache[nextImage].onload = function(){this.loaded=true};
    slideCache[nextImage].src = nextImage;
  }
  
}