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) {
		navi_paper_over = newImage("images/navi_paper-over.gif");
		navi_materials_over = newImage("images/navi_materials-over.gif");
		navi_insurance_over = newImage("images/navi_insurance-over.gif");
		navi_euchol_over = newImage("images/navi_euchol-over.gif");
		navi_profile_over = newImage("images/navi_profile-over.gif");
		navi_history_over = newImage("images/navi_history-over.gif");
		privacy_over = newImage("images/privacy-over.gif");
		preloadFlag = true;
	}
}