if (document.images) {
    nav_home = new Image
    nav_home_1 = new Image
    nav_kids = new Image
    nav_kids_1 = new Image
    nav_teens = new Image
    nav_teens_1 = new Image
    nav_parents = new Image
    nav_parents_1 = new Image
    nav_librarians = new Image
    nav_librarians_1 = new Image
    nav_contact = new Image
    nav_contact_1 = new Image


    nav_home.src = '/images/nav_home.gif'
    nav_home_1.src = '/images/nav_home_1.gif'
    nav_kids.src = '/images/nav_kids.gif'
    nav_kids_1.src = '/images/nav_kids_1.gif'
    nav_teens.src = '/images/nav_teens.gif'
    nav_teens_1.src = '/images/nav_teens_1.gif'
    nav_parents.src = '/images/nav_parents.gif'
    nav_parents_1.src = '/images/nav_parents_1.gif'
    nav_librarians.src = '/images/nav_librarians.gif'
    nav_librarians_1.src = '/images/nav_librarians_1.gif'
    nav_contact.src = '/images/nav_contact.gif'
    nav_contact_1.src = '/images/nav_contact_1.gif'


    }else{


    nav_home = ""
    nav_home_1 = ""
    document.home = ""

    nav_kids = ""
    nav_kids_1 = ""
    document.kids = ""

    nav_teens = ""
    nav_teens_1 = ""
    document.teens = ""

    nav_parents = ""
    nav_parents_1 = ""
    document.parents = ""

    nav_librarians = ""
    nav_librarians_1 = ""
    document.librarians = ""

    nav_contact = ""
    nav_contact_1 = ""
    document.contact= ""

    }