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_products_over = newImage("naviparts/navi_products-over.gif");
		navi_company_over = newImage("naviparts/navi_company-over.gif");
		navi_relative_over = newImage("naviparts/navi_relative-over.gif");
		navi_recruit_over = newImage("naviparts/navi_recruit-over.gif");
		navi_showroom_over = newImage("naviparts/navi_showroom-over.gif");
		preloadFlag = true;
	}
}

function random_img(){
	var imgarray = new Array("image.jpg","image2.jpg","image3.jpg");
	// imgarray.length
	var dd = new Date();
	var sec = dd.getSeconds()
	var curimg = imgarray[sec % imgarray.length];
	// debug :-0
	// alert("<img src=\"" + curimg + "\">");
	document.write("<img src=\"" + curimg + "\" WIDTH=\"740\" HEIGHT=\"350\">");
}