var gPreLoadList = new Array("/brewery/common/images/navi_btn_01_over.gif"
					,"/brewery/common/images/navi_btn_02_over.gif"
					,"/brewery/common/images/navi_btn_03_over.gif"
					,"/brewery/common/images/navi_btn_04_over.gif"
					,"/brewery/common/images/navi_btn_05_over.gif");


var onImages = new Array();
function preLoad(){
	for (field in gPreLoadList) {
		onImages[field] = new Image();
		onImages[field].src = gPreLoadList[field];
	}
}

function changeImage(imageName, fileName) {
	if(!document.images)return;
	document.images[imageName].src = fileName;
}