var pixStep = 2;
var timeStep = 20;

function initScroller(delka)
{
   
   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();
	
}

function scrollLeft()
{
   if (position <= zacatek) {
	  position = position + pixStep;
	  scroller.style.left = position + "px";
	  scrollTime = setTimeout("scrollLeft()", timeStep);
	} else {
      document.getElementById('sipka_left').src='/img/fotkypos_left_end.jpg';
   }

}

function scrollRight()
{
   if (position >= konec) {
      position = position - pixStep;
      scroller.style.left = position + "px";
      scrollTime = setTimeout("scrollRight()", timeStep);
   } else {
      document.getElementById('sipka_right').src='/img/fotkypos_right_end.jpg';
   }

}

function leftMouseover(img_h)
{
	scrollLeft();
}

function leftMouseout(img_h)
{
	clearTimeout(scrollTime);
	document.getElementById('sipka_left').src='/img/fotkypos_left.jpg';
}

function rightMouseover(img_h)
{
	scrollRight();
}

function rightMouseout(img_h)
{
	clearTimeout(scrollTime);
	document.getElementById('sipka_right').src='/img/fotkypos_right.jpg';
}

function pridat_fotku(src, width, popis) 
{
   obrazky_src[cislo_obrazku] = src;
   obrazky_width[cislo_obrazku] = width;
   obrazky_popis[cislo_obrazku] = popis;
   cislo_obrazku++;
}
function otevrit_fotku(cislo) {
   otevrene_cislo = cislo;

   document.getElementById("nahled_fotky_fotka").src=obrazky_src[cislo];
   document.getElementById("nahled_fotky").style.width=obrazky_width[cislo] + "px";
   document.getElementById("nahled_popis_fotky").innerHTML=obrazky_popis[cislo];
   document.getElementById("nahled_fotky").style.display='block';
}
function zavrit_nahled() {
   document.getElementById('nahled_fotky').style.display='none';
}

function posun_vlevo() {
   old_cislo = otevrene_cislo;
   otevrene_cislo--;
   if (otevrene_cislo < 0) {
      otevrene_cislo = old_cislo;
   }
   
   document.getElementById("nahled_fotky_fotka").src=obrazky_src[otevrene_cislo];
   document.getElementById("nahled_fotky").style.width=obrazky_width[otevrene_cislo] + "px";
   document.getElementById("nahled_popis_fotky").innerHTML=obrazky_popis[otevrene_cislo];
   document.getElementById("nahled_fotky").style.display='block';
}
function posun_vpravo() {
   old_cislo = otevrene_cislo;
   otevrene_cislo++;
   if (otevrene_cislo >= cislo_obrazku) {
      otevrene_cislo = old_cislo;
   }

   document.getElementById("nahled_fotky_fotka").src=obrazky_src[otevrene_cislo];
   document.getElementById("nahled_fotky").style.width=obrazky_width[otevrene_cislo] + "px";
   document.getElementById("nahled_popis_fotky").innerHTML=obrazky_popis[otevrene_cislo];
   document.getElementById("nahled_fotky").style.display='block';
}