window.addEvent('domready', function() {

	var items = $$('.slideImg'); 
	var numItems = items.length;  // pocet
  	var itemNum = 0;
  	var fadeTime = 2000;
	var slideTimer = 3000; 
  
	items.each(function(element, index) {
		
		// prvni element
		if(index == 0){
		}
		else{
			element.set('opacity', 0);
		}		
	});	
	
	var slideShow = function(){ 
				
		var curItem = items[itemNum]; 
		
		if(itemNum < (numItems - 1)){
			itemNum++; 
		}
		else{
			itemNum = 0;
		}
				
		var newItem = items[itemNum];
		
		curItem.set('tween', {duration: fadeTime});
		newItem.set('tween', {duration: fadeTime});
		curItem.tween('opacity', 0);
		newItem.tween('opacity', 1);
	}
	slideShow.periodical(slideTimer); 		
});