if (document.images) {
    nav_europe_0 = new Image
    nav_europe_1 = new Image
    nav_usa_0 = new Image
    nav_usa_1 = new Image
    nav_canada_0 = new Image
    nav_canada_1 = new Image
    nav_worldwide_1 = new Image
    nav_worldwide_0 = new Image


    nav_europe_0.src = 'images/europe_0.gif'
    nav_europe_1.src = 'images/europe_1.jpg'
    nav_usa_0.src = 'images/usa_0.gif'
    nav_usa_1.src = 'images/usa_1.jpg'
    nav_canada_0.src = 'images/canada_0.gif'
    nav_canada_1.src = 'images/canada_1.jpg'
    nav_worldwide_0.src = 'images/worldwide_0.gif'
    nav_worldwide_1.src = 'images/worldwide_1.jpg'


    }else{


    nav_europe_0 = ""
    nav_europe_1 = ""
    document.europe = ""

    nav_usa_0 = ""
    nav_usa_1 = ""
    document.usa = ""

    nav_canada_0 = ""
    nav_canada_1 = ""
    document.canada = ""

    nav_worldwide_0 = ""
    nav_worldwide_1 = ""
    document.worldwide= ""

    }