// swap_image.js
var imagesNormal = new Object();
var imagesHilite = new Object();
function SwapImage (name,normalSrc,hiliteSrc) {
   this.name = name;
   this.normalSrc = normalSrc;
   this.hiliteSrc = hiliteSrc;
}

function setupSwapImages(swapImages) {
    preloadSwapImages(swapImages);
    setupSwapEvent(swapImages);
}


function preloadSwapImages (a) {
    for (var i=0; i < a.length; i++){
        imagesNormal[a[i].name] = new Image();
        imagesNormal[a[i].name].src = a[i].normalSrc;
        imagesHilite[a[i].name] = new Image();
        imagesHilite[a[i].name].src = a[i].hiliteSrc;
    }
}
function setupSwapEvent (a) {
    for (var i=0; i<a.length; i++){
		
		var image = $(a[i].name);
		if (image.getAttribute("src")){
   			image.onmouseover = function () {swapImage( this, "hilite" );}
   			image.onmouseout  = function () {swapImage( this, "normal" );}
		}
		/*
        var images = getElementsByClassName(a[i].name);
        for (var j=0; j<images.length; j++){
            var image = images[j];
            if (image.getAttribute("src")){
               image.onmouseover = function () {swapImage( this, "hilite" );}
               image.onmouseout  = function () {swapImage( this, "normal" );}
            }
        }
*/
    }
}

function swapImage(element,mode){
	if(mode == 'hilite') element.src = imagesHilite[element.getAttribute('id')].src;
	if(mode == 'normal') element.src = imagesNormal[element.getAttribute('id')].src;
}

// copied from prototype.js v1.3.1
// http://prototype.conio.net/
function getElementsByClassName (className) {
  var children = document.getElementsByTagName('*') || document.all;
  var elements = new Array();
  for (var i = 0; i < children.length; i++) {
    var child = children[i];
    var classNames = child.className.split(' ');
    for (var j = 0; j < classNames.length; j++) {
      if (classNames[j] == className) {
        elements.push(child);
        break;
      }
    }
  }
  return elements;
}
/*
function $() {
  var elements = new Array();

  for (var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (typeof element == 'string')
      element = document.getElementById(element);

    if (arguments.length == 1) 
      return element;

    elements.push(element);
  }

  return elements;
}
*/