var img = new Array();

img[901] = new Image();  img[901].src="/images/menu_hom.gif";
img[902] = new Image();  img[902].src="/images/menu_hom_.gif";
img[903] = new Image();  img[903].src="/images/menu_lif.gif";
img[904] = new Image();  img[904].src="/images/menu_lif_.gif";
img[905] = new Image();  img[905].src="/images/menu_cty.gif";
img[906] = new Image();  img[906].src="/images/menu_cty_.gif";
img[907] = new Image();  img[907].src="/images/menu_biz.gif";
img[908] = new Image();  img[908].src="/images/menu_biz_.gif";
img[909] = new Image();  img[909].src="/images/menu_tor.gif";
img[910] = new Image();  img[910].src="/images/menu_tor_.gif";

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