function img_prev(pocet){
  if(!this.obrazekNum){this.obrazekNum = 1;}
  if(this.obrazekNum>1){
    document.getElementById("produkt_"+(this.obrazekNum)).className = "pro_img_sup";
    document.getElementById("produkt_"+((this.obrazekNum)-1)).className = "pro_img_sup visiblesup";
    this.obrazekNum = this.obrazekNum - 1;
  }
  else{
    document.getElementById("produkt_"+(this.obrazekNum)).className = "pro_img_sup";
    document.getElementById("produkt_"+pocet).className = "pro_img_sup visiblesup";
    this.obrazekNum = pocet;
  }
}

function img_next(pocet){
  if(!this.obrazekNum){this.obrazekNum = 1;}
  if(this.obrazekNum<pocet){
    document.getElementById("produkt_"+(this.obrazekNum)).className = "pro_img_sup";
    document.getElementById("produkt_"+((this.obrazekNum)+1)).className = "pro_img_sup visiblesup";
    this.obrazekNum = this.obrazekNum + 1;
  }
  else{
    document.getElementById("produkt_"+(this.obrazekNum)).className = "pro_img_sup";
    document.getElementById("produkt_1").className = "pro_img_sup visiblesup";
    this.obrazekNum = 1;
  }
}

function theRotator() {
	//Set the opacity of all images to 0
	$j('div#rotator ul li').css({opacity: 0.0});
	
	//Get the first image and display it (gets set to full opacity)
	$j('div#rotator ul li:first').css({opacity: 1.0});
		
	//Call the rotator function to run the slideshow, 6000 = change to next image after 6 seconds
	setInterval('rotate()',2500);
	
}
 
function rotate() {	
	//Get the first image
	var current = ($j('div#rotator ul li.show')?  $j('div#rotator ul li.show') : $j('div#rotator ul li:first'));
  
	//Get next image, when it reaches the end, rotate it back to the first image
	var next = ((current.next().length) ? ((current.next().hasClass('show')) ? $j('div#rotator ul li:first') :current.next()) : $j('div#rotator ul li:first'));	
	
	var id_prvku = (next.attr('id')).slice(9);
	var id_prvku_min = (current.attr('id')).slice(9);
	document.getElementById("butindex_"+id_prvku).className = "index_button active";
	document.getElementById("butindex_"+id_prvku_min).className = "index_button";
	/*alert(id_prvku);*/
	
	//Set the fade in effect for the next image, the show class has higher z-index
	next.css({opacity: 0.0})
	.addClass('show')
	.animate({opacity: 1.0}, 1000);
 
	//Hide the current image
	current.animate({opacity: 0.0}, 1000)
	.removeClass('show');
	
};
 
$j(document).ready(function() {		
	//Load the slideshow
	theRotator();
});