var interval = 10000;
var random_display = 0;
var imageDir = "images/";
var waitflag = true;

var imageNum = 0;
imageArray = new Array();
imageArray[imageNum++] = new imageItem(imageDir + "slide_2.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "slide_1.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "slide_3.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "slide_4.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "slide_5.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "slide_6.jpg");

var totalImages = imageArray.length;

function setOpacity(obj, opacity) {
  opacity = (opacity == 100)?99.999:opacity;

  // IE/Win
  obj.style.filter = "alpha(opacity:"+opacity+")";

  // Safari<1.2, Konqueror
  obj.style.KHTMLOpacity = opacity/100;

  // Older Mozilla and Firefox
  obj.style.MozOpacity = opacity/100;

  // Safari 1.2, newer Firefox and Mozilla, CSS3
  obj.style.opacity = opacity/100;
}

function fadeIn(objId,opacity) {
  if (document.getElementById) {
    obj = document.getElementById(objId);
    if (opacity <= 100) {
      setOpacity(obj, opacity);
      opacity += 10;
      window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 100);
    }
  }
}

function fadeOut(objId,opacity) {
  if (document.getElementById) {
    obj = document.getElementById(objId);
    if (opacity >= 0) {
    	setOpacity(obj, opacity);
        opacity -= 10;
        window.setTimeout("fadeOut('"+objId+"',"+opacity+")", 100);
    } else {
    	waitflag=false;
    }
  }
}

function imageItem(image_location) {
	this.image_item = new Image();
	this.image_item.src = image_location;
}

function get_ImageItemLocation(imageObj) {
	return(imageObj.image_item.src)
}

function randNum(x, y) {
	var range = y - x + 1;
	return Math.floor(Math.random() * range) + x;
}

function getNextImage() {
	if (random_display) {
		imageNum = randNum(0, totalImages-1);
	} else {
		imageNum = (imageNum+1) % totalImages;
	}
	var new_image = get_ImageItemLocation(imageArray[imageNum]);
	return(new_image);
}

function getPrevImage() {
	imageNum = (imageNum-1) % totalImages;
	var new_image = get_ImageItemLocation(imageArray[imageNum]);
	return(new_image);
}

function prevImage(place) {
	var new_image = getPrevImage();
	document[place].src = new_image;
}

function switchImage(place) {
	var new_image = getNextImage();

        var doit = "fadeOut('"+place+"', 100)";
        setTimeout(doit, 9000);

        document[place].src = new_image;

	fadeIn(place, 0);

        var recur_call = "switchImage('"+place+"')";
	timerID = setTimeout(recur_call, interval);
}