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if (document.images) {

var onImgArray = new Array()
onImgArray[0] = new Image(137,24)
onImgArray[1] = new Image(137,24)
onImgArray[2] = new Image(137,24)
onImgArray[3] = new Image(137,24)
onImgArray[4] = new Image(137,24)

onImgArray[0].src = "http://tomarin.ryutan.net/img/bt_navi01_on.gif"
onImgArray[1].src = "http://tomarin.ryutan.net/img/bt_navi02_on.gif"
onImgArray[2].src = "http://tomarin.ryutan.net/img/bt_navi03_on.gif"
onImgArray[3].src = "http://tomarin.ryutan.net/img/bt_navi04_on.gif"
onImgArray[4].src = "http://tomarin.ryutan.net/img/bt_navi05_on.gif"

var offImgArray = new Array()
offImgArray[0] = new Image(137,24)
offImgArray[1] = new Image(137,24)
offImgArray[2] = new Image(137,24)
offImgArray[3] = new Image(137,24)
offImgArray[4] = new Image(137,24)

offImgArray[0].src = "http://tomarin.ryutan.net/img/bt_navi01_off.gif"
offImgArray[1].src = "http://tomarin.ryutan.net/img/bt_navi02_off.gif"
offImgArray[2].src = "http://tomarin.ryutan.net/img/bt_navi03_off.gif"
offImgArray[3].src = "http://tomarin.ryutan.net/img/bt_navi04_off.gif"
offImgArray[4].src = "http://tomarin.ryutan.net/img/bt_navi05_off.gif"

}

function imageOn(i) {
if (document.images) {
document.images["menu" + i].src = onImgArray[i].src
}
}

function imageOff(i) {
if (document.images) {
document.images["menu" + i].src = offImgArray[i].src
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}
                
//-->