if (document.images) {
    var img = new Array();
    img[1] = new Image(); img[1].src = "img/bg_m_sel.gif";
    img[2] = new Image(); img[2].src = "img/bg_m_ulsub.gif";
    img[3] = new Image(); img[3].src = "img/bg_m_lisub.gif";
    img[4] = new Image(); img[4].src = "img/bg_m_asub.gif";
    img[5] = new Image(); img[5].src = "img/bg_m_asuba.gif";
}