var DHTML = 0, DOM = 0, IE = 0, NS = 0;
if ( document.getElementById ) {
    DHTML = 1;
    DOM = 1;
} else if ( document.all  &&  !DOM ) {
    DHTML = 1;
    IE = 1;
} else if ( document.layers  &&  !DOM  &&  !IE ) {
    DHTML = 1;
    NS = 1;
}

function showId( anId) {
    if ( DOM ) {
        document.getElementById( anId).style.visibility = "visible";
    } else if ( IE ) {
        document.all[anId].style.visibility = "visible";
    } else if ( NS ) {
        document.layers[anId].visibility = "show";
        /* document.anId.visibility = "show"; */
    }
}

function hideId( anId) {
    if ( DOM ) {
        document.getElementById( anId).style.visibility = "hidden";
    } else if ( IE ) {
        document.all[anId].style.visibility = "hidden";
    } else if ( NS ) {
        document.layers[anId].visibility = "hide";
        /* document.anId.visibility = "hide"; */
    }
}