function preload(){
	btn_ = new Array();
	for (i=1; i<11; i++){
		btn_[i] = new Image();
		btn_[i].src = "/product/mazda5/img/common/btn_" + [i] + "_on.gif";
	}
	navisubIMG = new Array();
	for (i=1; i<9; i++){	
		navisubIMG[i] = new Image();
		navisubIMG[i].src = "/product/mazda5/img/common/btn_sub" + [i] + "_on.gif";
	}
}