var img = new Array();

img[901] = new Image();  img[901].src="images/menu_giin.gif";
img[902] = new Image();  img[902].src="images/menu_giin_.gif";
img[903] = new Image();  img[903].src="images/menu_katu.gif";
img[904] = new Image();  img[904].src="images/menu_katu_.gif";
img[905] = new Image();  img[905].src="images/menu_seisaku.gif";
img[906] = new Image();  img[906].src="images/menu_seisaku_.gif";
img[907] = new Image();  img[907].src="images/menu_koho.gif";
img[908] = new Image();  img[908].src="images/menu_koho_.gif";
img[909] = new Image();  img[909].src="images/menu_home.gif";
img[910] = new Image();  img[910].src="images/menu_home_.gif";

img[701] = new Image();  img[701].src="images/new_top.gif";
img[702] = new Image();  img[702].src="images/new_top_.gif";

function change_image(nam,num) {
        if(navigator.appVersion.charAt(0)>= 3) {
                document.images[nam].src = img[num].src;
        }
}