/*
	Standards Compliant Rollover Script
	Author : Daniel Nolan
	http://www.bleedingego.co.uk/webdev.php
*/

function initRollovers() {
	if (!document.getElementById) return
	
	var aImages = document.getElementsByTagName('img');

	// 検索ボタン専用処理
	var searchBtn = document.getElementById('search_submit');
	if (searchBtn != null) {
		addRolloverEvent(searchBtn);
	}

	for (var i = 0; i < aImages.length; i++) {
		addRolloverEvent(aImages[i]);
	}
}

function addRolloverEvent(aImage) {

	var aPreLoad;
	var sTempSrc;

	if (aImage.className == 'imgover') {
		var src = aImage.getAttribute('src');
		var ftype = src.substring(src.lastIndexOf('.'), src.length);
		var hsrc = src.replace(ftype, '_o'+ftype);

		aImage.setAttribute('hsrc', hsrc);
		
		aPreLoad = new Image();
		aPreLoad.src = hsrc;
		
		aImage.onmouseover = function() {
			sTempSrc = this.getAttribute('src');
			this.setAttribute('src', this.getAttribute('hsrc'));
		}	
		
		aImage.onmouseout = function() {
			if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_o'+ftype, ftype);
			this.setAttribute('src', sTempSrc);
		}
	}
}

try{
	window.addEventListener("load",initRollovers,false);
}catch(e){
	window.attachEvent("onload",initRollovers);
}