if(navigator.appVersion.charAt(0) >="3"){
var navi = new Array();
navi[0] = new Image(); navi[0].src = "img/menu_01.gif"
navi[1] = new Image(); navi[1].src = "img/menu_01_on.gif"
navi[2] = new Image(); navi[2].src = "img/menu_02.gif"
navi[3] = new Image(); navi[3].src = "img/menu_02_on.gif"
navi[4] = new Image(); navi[4].src = "img/menu_03.gif"
navi[5] = new Image(); navi[5].src = "img/menu_03_on.gif"
navi[6] = new Image(); navi[6].src = "img/menu_04.gif"
navi[7] = new Image(); navi[7].src = "img/menu_04_on.gif"
}

function naviOn(nam,num){
		document.images[nam].src = navi[num].src;
}