function Layer()
{
  if (document.getElementById("cd1").style.visibility == 'visible')  
    document.getElementById("cd1").style.visibility = 'hidden';
  else                
    document.getElementById("cd1").style.visibility = 'visible';
}

function Layer2()
{
  if (document.getElementById("cd2").style.visibility == 'visible')  
    document.getElementById("cd2").style.visibility = 'hidden';
  else                
    document.getElementById("cd2").style.visibility = 'visible';
}

function Layer3()
{
  if (document.getElementById("cd3").style.visibility == 'visible')  
    document.getElementById("cd3").style.visibility = 'hidden';
  else                
    document.getElementById("cd3").style.visibility = 'visible';
}

function Layer4()
{
  if (document.getElementById("cd4").style.visibility == 'visible')  
    document.getElementById("cd4").style.visibility = 'hidden';
  else                
    document.getElementById("cd4").style.visibility = 'visible';
}

function Layer5()
{
  if (document.getElementById("cd5").style.visibility == 'visible')  
    document.getElementById("cd5").style.visibility = 'hidden';
  else                
    document.getElementById("cd5").style.visibility = 'visible';
}

function Layer6()
{
  if (document.getElementById("cd6").style.visibility == 'visible')  
    document.getElementById("cd6").style.visibility = 'hidden';
  else                
    document.getElementById("cd6").style.visibility = 'visible';
}


function Layer7()
{
  if (document.getElementById("cd7").style.visibility == 'visible')  
    document.getElementById("cd7").style.visibility = 'hidden';
  else                
    document.getElementById("cd7").style.visibility = 'visible';
}

function Layer8()
{
  if (document.getElementById("cd8").style.visibility == 'visible')  
    document.getElementById("cd8").style.visibility = 'hidden';
  else                
    document.getElementById("cd8").style.visibility = 'visible';
}

function Layer9()
{
  if (document.getElementById("cd9").style.visibility == 'visible')  
    document.getElementById("cd9").style.visibility = 'hidden';
  else                
    document.getElementById("cd9").style.visibility = 'visible';
}

function Layer10()
{
  if (document.getElementById("cd10").style.visibility == 'visible')  
    document.getElementById("cd10").style.visibility = 'hidden';
  else                
    document.getElementById("cd10").style.visibility = 'visible';
}

function Layer11()
{
  if (document.getElementById("cd11").style.visibility == 'visible')  
    document.getElementById("cd11").style.visibility = 'hidden';
  else                
    document.getElementById("cd11").style.visibility = 'visible';
}

function Layer12()
{
  if (document.getElementById("cd12").style.visibility == 'visible')  
    document.getElementById("cd12").style.visibility = 'hidden';
  else                
    document.getElementById("cd12").style.visibility = 'visible';
}

function Layer13()
{
  if (document.getElementById("cd13").style.visibility == 'visible')  
    document.getElementById("cd13").style.visibility = 'hidden';
  else                
    document.getElementById("cd13").style.visibility = 'visible';
}

function Layer14()
{
  if (document.getElementById("cd14").style.visibility == 'visible')  
    document.getElementById("cd14").style.visibility = 'hidden';
  else                
    document.getElementById("cd14").style.visibility = 'visible';
}

function Layer15()
{
  if (document.getElementById("cd15").style.visibility == 'visible')  
    document.getElementById("cd15").style.visibility = 'hidden';
  else                
    document.getElementById("cd15").style.visibility = 'visible';
}

function Layer16()
{
  if (document.getElementById("cd16").style.visibility == 'visible')  
    document.getElementById("cd16").style.visibility = 'hidden';
  else                
    document.getElementById("cd16").style.visibility = 'visible';
}

function Layer17()
{
  if (document.getElementById("cd17").style.visibility == 'visible')  
    document.getElementById("cd17").style.visibility = 'hidden';
  else                
    document.getElementById("cd17").style.visibility = 'visible';
}

function Layer18()
{
  if (document.getElementById("cd18").style.visibility == 'visible')  
    document.getElementById("cd18").style.visibility = 'hidden';
  else                
    document.getElementById("cd18").style.visibility = 'visible';
}

function Layer19()
{
  if (document.getElementById("cd19").style.visibility == 'visible')  
    document.getElementById("cd19").style.visibility = 'hidden';
  else                
    document.getElementById("cd19").style.visibility = 'visible';
}

function Layer20()
{
  if (document.getElementById("cd20").style.visibility == 'visible')  
    document.getElementById("cd20").style.visibility = 'hidden';
  else                
    document.getElementById("cd20").style.visibility = 'visible';
}

function Layer21()
{
  if (document.getElementById("cd21").style.visibility == 'visible')  
    document.getElementById("cd21").style.visibility = 'hidden';
  else                
    document.getElementById("cd21").style.visibility = 'visible';
}

function Layer22()
{
  if (document.getElementById("cd22").style.visibility == 'visible')  
    document.getElementById("cd22").style.visibility = 'hidden';
  else                
    document.getElementById("cd22").style.visibility = 'visible';
}

function Layer23()
{
  if (document.getElementById("cd23").style.visibility == 'visible')  
    document.getElementById("cd23").style.visibility = 'hidden';
  else                
    document.getElementById("cd23").style.visibility = 'visible';
}

function Layer24()
{
  if (document.getElementById("cd24").style.visibility == 'visible')  
    document.getElementById("cd24").style.visibility = 'hidden';
  else                
    document.getElementById("cd24").style.visibility = 'visible';
}

function Layer25()
{
  if (document.getElementById("cd25").style.visibility == 'visible')  
    document.getElementById("cd25").style.visibility = 'hidden';
  else                
    document.getElementById("cd25").style.visibility = 'visible';
}

function Layer26()
{
  if (document.getElementById("cd26").style.visibility == 'visible')  
    document.getElementById("cd26").style.visibility = 'hidden';
  else                
    document.getElementById("cd26").style.visibility = 'visible';
}

function Layer27()
{
  if (document.getElementById("cd27").style.visibility == 'visible')  
    document.getElementById("cd27").style.visibility = 'hidden';
  else                
    document.getElementById("cd27").style.visibility = 'visible';
}

function Layer28()
{
  if (document.getElementById("cd28").style.visibility == 'visible')  
    document.getElementById("cd28").style.visibility = 'hidden';
  else                
    document.getElementById("cd28").style.visibility = 'visible';
}

function Layer29()
{
  if (document.getElementById("cd29").style.visibility == 'visible')  
    document.getElementById("cd29").style.visibility = 'hidden';
  else                
    document.getElementById("cd29").style.visibility = 'visible';
}

function Layer30()
{
  if (document.getElementById("cd30").style.visibility == 'visible')  
    document.getElementById("cd30").style.visibility = 'hidden';
  else                
    document.getElementById("cd30").style.visibility = 'visible';
}







function Layerd1()
{
  if (document.getElementById("down1").style.visibility == 'visible')  
    document.getElementById("down1").style.visibility = 'hidden';
  else                
    document.getElementById("down1").style.visibility = 'visible';
}

function Layerd2()
{
  if (document.getElementById("down2").style.visibility == 'visible')  
    document.getElementById("down2").style.visibility = 'hidden';
  else                
    document.getElementById("down2").style.visibility = 'visible';
}

function Layerd3()
{
  if (document.getElementById("down3").style.visibility == 'visible')  
    document.getElementById("down3").style.visibility = 'hidden';
  else                
    document.getElementById("down3").style.visibility = 'visible';
}