if (document.images) {
    btn01Cold = new Image
    btn01Hot = new Image
    btn02Cold = new Image
    btn02Hot = new Image
    btn03Cold = new Image
    btn03Hot = new Image

    btn01Cold.src = "images/mainBienCold.jpg"
    btn01Hot.src = "images/mainBienHot.jpg"
    btn02Cold.src = "images/mainWelcCold.jpg"
    btn02Hot.src = "images/mainWelcHot.jpg"
    btn03Cold.src = "images/mainWelcColdJP.gif"
    btn03Hot.src = "images/mainWelcHotJP.gif"
}
else {

    btn01Cold = ""
    btn01Hot = ""
    document.button01 = ""
    btn02Cold = ""
    btn02Hot = ""
    document.button02 = ""
    btn03Cold = ""
    btn03Hot = ""
    document.button03 = ""
}