function showLinks(section) {
    hideLinks(false);
    document.getElementById(section).style.visibility = "visible";
}

function hideLinks(hideMain) {
    if (hideMain) {
        document.getElementById("linksMain").style.visibility = "hidden";
    }
    document.getElementById("linksAccessories").style.visibility = "hidden";
    document.getElementById("linksGearBoxes").style.visibility = "hidden";
    document.getElementById("linksBearings").style.visibility = "hidden";
    document.getElementById("linksBatchPlants").style.visibility = "hidden";
    document.getElementById("linksCabParts").style.visibility = "hidden";
    document.getElementById("linksChain").style.visibility = "hidden";
    document.getElementById("linksControls").style.visibility = "hidden";
    document.getElementById("linksElectrical").style.visibility = "hidden";
    document.getElementById("linksFilters").style.visibility = "hidden";
    document.getElementById("linksHydraulics").style.visibility = "hidden";
    document.getElementById("linksLubrication").style.visibility = "hidden";
    document.getElementById("linksMiscellaneous").style.visibility = "hidden";
    document.getElementById("linksPneumatic").style.visibility = "hidden";
    document.getElementById("linksSuspensions").style.visibility = "hidden";
    document.getElementById("linksValves").style.visibility = "hidden";
}