var pixStep = 2;
var timeStep = 20;
var itemHeight = 20; /* v px */

/* SCROLLER 1 */
function initScroller(delka, itemCount)
{
	
	itemTotalHeight = itemCount * itemHeight;
	
	if(itemTotalHeight < delka)
	{
		document.getElementById('sipka_right').style.backgroundImage="none";
	}
	
	
   cislo_obrazku = 0;
	position = 0;
	zacatek = 0;
	konec = zacatek - delka;
	scroller = document.getElementById("scroll_content");
	//document.getElementById('hlavni_odkaz').alt='0';
	obrazky_src = new Array();
	obrazky_width = new Array();
	obrazky_popis = new Array();
	
	document.getElementById('sipka_left').style.backgroundImage="none";
	
	
	
	
}

function scrollLeft()
{
	document.getElementById('sipka_right').style.backgroundImage="url('/images/hlasoval-sipka-dolu-aktivni.png')";
	
   if (position <= zacatek - 2 ) {
	  position = position + pixStep;
	  scroller.style.top = position + "px";
	  scrollTime = setTimeout("scrollLeft()", timeStep);
	  leftEnd = false;
	} else {
		leftEnd = true;
      document.getElementById('sipka_left').style.backgroundImage="none";
   }

}

function scrollRight()
{
	document.getElementById('sipka_left').style.backgroundImage="url('/images/hlasoval-sipka-nahoru-aktivni.png')";
	
   if (position >= konec) {
      position = position - pixStep;
      scroller.style.top = position + "px";
      scrollTime = setTimeout("scrollRight()", timeStep);
      rightEnd = false;
   } else {
	   rightEnd = true;
       document.getElementById('sipka_right').style.backgroundImage="none";
   }

}

function leftMouseover(img_h)
{
	document.getElementById('sipka_left').style.backgroundImage='url("/images/hlasoval-sipka-nahoru.png")';
	scrollLeft();
}

function leftMouseout(img_h)
{
	clearTimeout(scrollTime);
	if( leftEnd == false )
	{
		document.getElementById('sipka_left').style.backgroundImage="url('/images/hlasoval-sipka-nahoru-aktivni.png')";
	}
}

function rightMouseover(img_h)
{
	document.getElementById('sipka_right').style.backgroundImage='url("/images/hlasoval-sipka-dolu.png")';
	scrollRight();
}

function rightMouseout(img_h)
{
	clearTimeout(scrollTime);
	if( rightEnd == false )
	{
		document.getElementById('sipka_right').style.backgroundImage="url('/images/hlasoval-sipka-dolu-aktivni.png')"; 
	}
	/* document.getElementById('sipka_right').style.backgroundImage="url('/images/hlasoval-sipka-dolu-aktivni.png')"; */
}