function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		header_02_9_over = newImage("images/header_02-9_over.gif");
		header_02_8_over = newImage("images/header_02-8_over.gif");
		header_02_7_over = newImage("images/header_02-7_over.gif");
		header_02_6_over = newImage("images/header_02-6_over.gif");
		header_02_5_over = newImage("images/header_02-5_over.gif");
		header_02_4_over = newImage("images/header_02-4_over.gif");
		header_02_3_over = newImage("images/header_02-3_over.gif");
		header_02_2_over = newImage("images/header_02-2_over.gif");
		header_02_1_over = newImage("images/header_02-1_over.gif");
		preloadFlag = true;
	}
}











trList = ["treeMenu1","treeMenu2","treeMenu3","treeMenu4","treeMenu5"];	//　ツリーメニューのリスト（インターネット事業部）
function exMenu(tName)
{
	for (i=0; i<trList.length; i++) eval(trList[i]).style.display = "none";
	tMenu = eval(tName).style;
	if (tMenu.display == 'none') tMenu.display = "block"; else tMenu.display = "none";
}