function opacityOF(id) {
    document.getElementById(id).style["opacity"] = "0.5";
    document.getElementById(id).style["-moz-opacity"] = "0.5";
    document.getElementById(id).style["-khtml-opacity"] = "0.5";
}

function opacityFL(id) {
    document.getElementById(id).style["opacity"] = "1.0";
    document.getElementById(id).style["-moz-opacity"] = "1.0";
    document.getElementById(id).style["-khtml-opacity"] = "1.0";
}