function initNavigations(){
	if (!document.getElementById) {
		return;
	}

	var nvPreLoad = new Array();
	var sTempSrc;
	var nvImages = document.getElementsByTagName('img');
	var wrapperObj = document.getElementById('wrapper');
	var categoryId = wrapperObj.firstChild.getAttribute('id');
	var stayNum;

	switch(categoryId){
		case "visit":
			stayNum = 1;
		break;
		case "classroom":
			stayNum = 2;
		break;
		case "checksheet":
			stayNum = 3;
		break;
		case "research":
			stayNum = 4;
		break;
		case "econico":
			stayNum = 5;
		break;
		case "events":
			stayNum = 5;
		break;
		case "eventlower":
			stayNum = 5;
		break;
		default:stayNum = 0;
	
	}
	var gNaviStaySrc = "gnv_0" + stayNum + ".gif";

	for (var i = 0; i < nvImages.length; i++) {

			if (nvImages[i].className == 'gnaviOver'){
				var src = nvImages[i].getAttribute('src');
				var ftype = src.substring(src.lastIndexOf('.'), src.length);
				srcStr = src.substring(src.lastIndexOf('/') + 1, src.length);

				if(srcStr == gNaviStaySrc) {
					var hsrc = src.replace(ftype, '_o' + ftype);
					nvImages[i].setAttribute('hsrc', hsrc);
					nvImages[i].setAttribute('src', nvImages[i].getAttribute('hsrc'));
				} else {
					var hsrc = src.replace(ftype, '_o' + ftype);
					nvImages[i].setAttribute('hsrc', hsrc);
					nvPreLoad[i] = new Image();
					nvPreLoad[i].src = hsrc;

					nvImages[i].onmouseover = function() {
						sTempSrc = this.getAttribute('src');
						this.setAttribute('src', this.getAttribute('hsrc'));
					}
					nvImages[i].onmouseout = function() {
						if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_s' + ftype, ftype);
						this.setAttribute('src', sTempSrc);
					}
				}
			}
	}
}
/*------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------*/


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