var swImg; swImg=new Array;

//
// 画像のプリロードを行なう
//
function HpbImgPreload() {
	var appVer=parseInt(navigator.appVersion);
	var isNC=(document.layers && (appVer >= 4)); // Netscape Navigator 4.0 or later
	var isIE=(document.all    && (appVer >= 4)); // Internet Explorer  4.0 or later

	if (isNC || isIE) {
		if (document.images) {
			var imgName = HpbImgPreload.arguments[0];
			var cnt;

			swImg[imgName] = new Array;
			for (cnt = 1; cnt < HpbImgPreload.arguments.length; cnt++) {
				swImg[imgName][HpbImgPreload.arguments[cnt]] = new Image();
				swImg[imgName][HpbImgPreload.arguments[cnt]].src = HpbImgPreload.arguments[cnt];
			}
		}
	}
}

//
// Imageオブジェクトを探す
//
function HpbImgFind(doc, imgName) {
	for (var i=0; i < doc.layers.length; i++) {
		var img = doc.layers[i].document.images[imgName];
		if (!img) img = HpbImgFind(doc.layers[i], imgName);
		if (img) return img;
	}
	return null;
}

//
// 画像を入れ換える
//
function HpbImgSwap(imgName, imgSrc) {
	var appVer=parseInt(navigator.appVersion);
	var isNC=(document.layers && (appVer >= 4)); // Netscape Navigator 4.0 or later
	var isIE=(document.all    && (appVer >= 4)); // Internet Explorer  4.0 or later

	if (isNC || isIE) {
		if (document.images) {
			var img = document.images[imgName];
			if (!img) img = HpbImgFind(document, imgName);
			if (img) img.src = imgSrc;
		}
	}
}