/*  ロールオーバーをclass名で */
	
	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 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(image,type){
			if (type=="hilite") {
				image.src = imagesHilite[image.className].src;
			}
			else if (type=="normal") {
				image.src = imagesNormal[image.className].src;
			}
		}
		
		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;
		}
		
	/*  ロールオーバーをclass名で */