function showLayer2()
    {    
    document.getElementById('Layer2').style.display="block";
    document.getElementById('Layer3').style.display="none";
    document.getElementById('Layer4').style.display="none";
    document.getElementById('Layer5').style.display="none";
    document.getElementById('Layer6').style.display="none";
}
function showLayer3()
    {    
    document.getElementById('Layer2').style.display="none";
    document.getElementById('Layer3').style.display="block";
    document.getElementById('Layer4').style.display="none";
    document.getElementById('Layer5').style.display="none";
    document.getElementById('Layer6').style.display="none";
}
function showLayer4()
    {
    document.getElementById('Layer2').style.display="none";
    document.getElementById('Layer3').style.display="none";
    document.getElementById('Layer4').style.display="block";
    document.getElementById('Layer5').style.display="none";
    document.getElementById('Layer6').style.display="none";
}
function showLayer5()
    {
    document.getElementById('Layer2').style.display="none";
    document.getElementById('Layer3').style.display="none";
    document.getElementById('Layer4').style.display="none";
    document.getElementById('Layer5').style.display="block";
    document.getElementById('Layer6').style.display="none";
}
function showLayer6()
    {    
    document.getElementById('Layer2').style.display="none";
    document.getElementById('Layer3').style.display="none";
    document.getElementById('Layer4').style.display="none";
    document.getElementById('Layer5').style.display="none";
    document.getElementById('Layer6').style.display="block";
}