if (document.images) { 
            leftmenu01on = new Image();
            leftmenu01on.src = "../../images/am/t_a2.gif";
            leftmenu02on = new Image();
            leftmenu02on.src = "../../images/am/t_b2.gif";
            leftmenu03on = new Image();
            leftmenu03on.src = "../../images/am/t_c2.gif";
            leftmenu04on = new Image();
            leftmenu04on.src = "../../images/am/t_d2.gif";
            leftmenu05on = new Image();
            leftmenu05on.src = "../../images/am/t_e2.gif";
            leftmenu06on = new Image();
            leftmenu06on.src = "../../images/am/t_f2.gif";
            leftmenu07on = new Image();
            leftmenu07on.src = "../../images/am/t_g2.gif";

            leftmenu01off = new Image();
            leftmenu01off.src = "../../images/am/t_a.gif";
            leftmenu02off = new Image();
            leftmenu02off.src = "../../images/am/t_b.gif";
            leftmenu03off = new Image();
            leftmenu03off.src = "../../images/am/t_c.gif";
            leftmenu04off = new Image();
            leftmenu04off.src = "../../images/am/t_d.gif";
            leftmenu05off = new Image();
            leftmenu05off.src = "../../images/am/t_e.gif";
            leftmenu06off = new Image();
            leftmenu06off.src = "../../images/am/t_f.gif";
            leftmenu07off = new Image();
            leftmenu07off.src = "../../images/am/t_g.gif";


        }
function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
        }
}
function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}