var images = new Array( './images/computer_repair.jpg',
			'./images/web_design.jpg',
			'./images/xbox_360_repair.jpg',
			'./images/ps3_repair.jpg');
			
var click = new Array( './computer_services/computer_repair.html',
			'./web_design/web_design.html',
			'./xbox_ps3_repair/console_repair.html',
			'./xbox_ps3_repair/console_repair.html');

var nextImage = 1;
var nextClick = 0;
var imageWidth = 886;
var imageHeight = 200;
var imageTimeout = 3000;




function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}


function setOpacity(el, opacity) {

	opacity /= 100;

	el.style.opacity = opacity;
	el.style.MozOpacity = opacity;
	el.style.filter = "alpha(opacity=" + (opacity*100) + ")";

}

function fadeImage(el, currentOpacity) {

	currentOpacity += 5;

	if (currentOpacity > 100) {
		setOpacity(el, 100);
		var prevEl = el.previousSibling ? el.previousSibling : el.parentNode.lastChild;
		prevEl.style.visibility = 'hidden';
		el.style.zIndex = 1;
		window.setTimeout(startFading, imageTimeout);
	}
	else {
		setOpacity(el, currentOpacity);
		window.setTimeout(function() { fadeImage(el, currentOpacity); }, 50);
	}

}


function startFading() {

	var el = document.getElementById('image-container').childNodes[nextImage];
  el.onclick = function(){window.location.href=click[nextClick]};
	el.style.visibility = 'visible';
	el.style.zIndex = 2;
	setOpacity(el, 0);
	fadeImage(el,0);
	nextImage = (nextImage < images.length-1) ? nextImage + 1 : 0;
	nextClick = (nextClick < click.length-1) ? nextClick + 1 : 0;


}


function pageLoad() {

	var el = document.getElementById('image-container');

	while (el.firstChild) { el.removeChild(el.firstChild); }

	el.style.width = imageWidth + 'px';
	el.style.height = imageHeight + 'px';

	for(var i=0; i<images.length; i++) {

		var t = document.createElement('img');
		t.setAttribute('src',images[i]);
		t.setAttribute('width',imageWidth);
		t.setAttribute('height',imageHeight);
		t.style.position = 'absolute';
		t.style.visibility = 'hidden';
		el.onclick = function(){window.location.href=click[nextClick]};
		el.appendChild(t);

	}
	
	el.firstChild.style.visibility = 'visible';

	window.setTimeout(startFading, imageTimeout);

}


addLoadEvent( pageLoad );