var imgpath = "images/";
var commonDir = "images/";
var scrollIndex = 0;

function initScroll() {
  if (scrollArray.length > 3) {
	 checkArrows();  
  }
}

function scrollImages(direction) {
  var numImgs = scrollArray.length;
  var imgdir = "";
  var txtdir = "";
  var txtext = "-txt";

  if (direction == "left") {
    // These lines are for continuous scrolling;
    //scrollIndex = (scrollIndex - 1) % numImgs;
    //if (scrollIndex < 0) {
    //  scrollIndex = numImgs + scrollIndex;
    //}

    // The next two lines are for scrolling that stops on each end
    if (scrollIndex - 1 < 0) return;
    scrollIndex = scrollIndex - 1;

    var start = 2;
    var incr = -1;
  } else if (direction == "right") {
    // This line is for continuous scrolling;
    //scrollIndex = (scrollIndex + 1) % numImgs;

    // The next two lines are for scrolling that stops on each end
    if (scrollIndex + 3 >= numImgs) return;
    scrollIndex = scrollIndex + 1;

    var start = 0;
    var incr = 1;
  } else {
    var start = 0;
    var incr = 1;
  }

  for (var i = start; i < 3 && i >= 0; i += incr) {
    var idx = (scrollIndex+i) % numImgs;
    if (idx < 0) {
      idx = numImgs + idx;
    }
    var imgname = scrollArray[idx];
    var imgsrc  = 'sc'+(i+1);
    document.images[imgsrc].src = imgpath+imgdir+imgname+".gif";
}
  checkArrows();
  }

function jumpImages(index) {
  scrollIndex = index;
  scrollImages('jump');
}

function hiliteBox() {
  document.images['b'+scrollIndex].src = commonDir+"box-hi.gif";

  for (var i = 0; i < scrollIndex; i++) {
    var img = document.images['b'+i];
    if (img.src.indexOf('-hi') != -1) img.src = commonDir+"box.gif";
  } 
  for (var i = scrollIndex+1; i <= scrollArray.length-5; i++) {
    var img = document.images['b'+i];
    if (img.src.indexOf('-hi') != -1) img.src = commonDir+"box.gif";
  }
}

function checkArrows() {
  var arrowName = commonDir+"arrow_";
  var arrowGrey = "_white";
  var arrowExt = ".gif";

  var leftGrey  = "";
  var rightGrey = "";
  var arrowToDisplay = "";

  if (scrollIndex == 0) {
    leftGrey = arrowGrey;
  } else if (scrollIndex + 3 >= scrollArray.length) {
    rightGrey = arrowGrey;
  }
  leftArrow  = arrowName+"top"+leftGrey+arrowExt;
  rightArrow = arrowName+"bot"+rightGrey+arrowExt;

  var leftImg  = document.arrowleft;
  if (leftImg.src.indexOf(leftArrow) == -1) leftImg.src = leftArrow;
  var rightImg = document.arrowright;
  if (rightImg.src.indexOf(rightArrow) == -1) rightImg.src = rightArrow;
}

function gotoItem(offset) {
  var idx = (scrollIndex + offset) % scrollArray.length;
 document.images['mainImg'].src = imgpath+scrollArray[idx]+"_lg"+".gif";
  //var path = scrollArray[idx];
  //gotoURL(path);
}

function gotoURL(path) {
  var host = "http://" + window.location.host;

  if (path != null && path != "") {
    window.location.href = host+path;
  }
}