var img = new Array();

img[801] = new Image();  img[801].src="images/menu_shisetsu.gif";
img[802] = new Image();  img[802].src="images/menu_shisetsu_.gif";
img[803] = new Image();  img[803].src="images/menu_yorozu.gif";
img[804] = new Image();  img[804].src="images/menu_yorozu_.gif";
img[805] = new Image();  img[805].src="images/menu_school.gif";
img[806] = new Image();  img[806].src="images/menu_school_.gif";
img[807] = new Image();  img[807].src="images/menu_haken.gif";
img[808] = new Image();  img[808].src="images/menu_haken_.gif";
img[809] = new Image();  img[809].src="images/menu_bon.gif";
img[810] = new Image();  img[810].src="images/menu_bon_.gif";
img[811] = new Image();  img[811].src="images/menu_joho.gif";
img[812] = new Image();  img[812].src="images/menu_joho_.gif";
img[813] = new Image();  img[813].src="images/menu_taishin.gif";
img[814] = new Image();  img[814].src="images/menu_taishin_.gif";
img[815] = new Image();  img[815].src="images/menu_access.gif";
img[816] = new Image();  img[816].src="images/menu_access_.gif";
img[817] = new Image();  img[817].src="images/menu_top.gif";
img[818] = new Image();  img[818].src="images/menu_top_.gif";

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