/*
	This function was taken from:
	http://www.rob-watson.co.uk/pages/38#javascript
*/

var images = new Array(
  'images/imgChng-1.jpg',
  'images/imgChng-2.jpg',
  'images/imgChng-3.jpg',
  'images/imgChng-4.jpg');

var nextImage = 1;
var imageWidth = 950;
var imageHeight = 125;
var imageTimeout = 4000;

function setOpacity(el, opacity) {

	//  Which opacity method does this browser support?

	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('changer').childNodes[nextImage];

	el.style.visibility = 'visible';
	el.style.zIndex = 2;
	setOpacity(el, 0);
	fadeImage(el,0);

	nextImage = (nextImage < images.length-1) ? nextImage + 1 : 0;

}


function pageLoad() {

	var el = document.getElementById('changer');

	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.appendChild(t);

	}

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

	window.setTimeout(startFading, imageTimeout);

}

//Nested Side Bar Menu (Mar 20th, 09)
//By Dynamic Drive: http://www.dynamicdrive.com/style/

var menuids=["menuLinks"] //Enter id(s) of each Side Bar Menu's main UL, separated by commas

function initsidebarmenu(){
for (var i=0; i<menuids.length; i++){
  var ultags=document.getElementById(menuids[i]).getElementsByTagName("ul")
    for (var t=0; t<ultags.length; t++){
  if (ultags[t].parentNode.parentNode.id==menuids[i]) //if this is a first level submenu
   ultags[t].style.left=(ultags[t].parentNode.offsetWidth) + "px" //dynamically position first level submenus to be width of main menu item
  else //else if this is a sub level submenu (ul)
    ultags[t].style.left=(ultags[t-1].getElementsByTagName("a")[0].offsetWidth) + "px" //position menu to the right of menu item that activated it
    ultags[t].parentNode.onmouseover=function(){
    this.getElementsByTagName("ul")[0].style.display="block"
    }
    ultags[t].parentNode.onmouseout=function(){
    this.getElementsByTagName("ul")[0].style.display="none"
    }
    }
  for (var t=ultags.length-1; t>-1; t--){ //loop through all sub menus again, and use "display:none" to hide menus (to prevent possible page scrollbars
  ultags[t].style.visibility="visible"
  ultags[t].style.display="none"
  }
  }
}

/*
	This function was taken from:
	http://simon.incutio.com/archive/2004/05/26/addLoadEvent
*/
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent( pageLoad );
addLoadEvent( initsidebarmenu );