if (document.images) {
    btn01Cold = new Image
    btn01Hot = new Image
    btn02Cold = new Image
    btn02Hot = new Image

    btn01Cold.src = "Images/mainBtnFrCold.jpg"
    btn01Hot.src = "Images/mainBtnFrHot.jpg"
    btn02Cold.src = "Images/mainBtnEngCold.jpg"
    btn02Hot.src = "Images/mainBtnEngHot.jpg"
}
else {

    btn01Cold = ""
    btn01Hot = ""
    document.button01 = ""
    btn02Cold = ""
    btn02Hot = ""
    document.button02 = ""
}