// a function to reveal a layer1
function show_sponsr1()
{
  var obj = document.getElementById("lyrsp1");                
  obj.style.visibility= "visible";        
}
function hide_sponsr1()
{
  var obj = document.getElementById("lyrsp1");               
  obj.style.visibility= "hidden";        
}


// a function to reveal a layer2
function show_sponsr2()
{
  var obj = document.getElementById("lyrsp2");                   
  obj.style.visibility= "visible";        
}

function hide_sponsr2()
{
  var obj = document.getElementById("lyrsp2");              
  obj.style.visibility= "hidden";        
}


// a function to reveal a layer3
function show_sponsr3()
{
  var obj = document.getElementById("lyrsp3");                
  obj.style.visibility= "visible";        
}
function hide_sponsr3()
{
  var obj = document.getElementById("lyrsp3");               
  obj.style.visibility= "hidden";        
}


// a function to reveal a layer4
function show_sponsr4()
{
  var obj = document.getElementById("lyrsp4");                   
  obj.style.visibility= "visible";        
}

function hide_sponsr4()
{
  var obj = document.getElementById("lyrsp4");              
  obj.style.visibility= "hidden";        
}

// a function to reveal a layer5
function show_sponsr5()
{
  var obj = document.getElementById("lyrsp5");                
  obj.style.visibility= "visible";        
}
function hide_sponsr5()
{
  var obj = document.getElementById("lyrsp5");               
  obj.style.visibility= "hidden";        
}


// a function to reveal a layer6
function show_sponsr6()
{
  var obj = document.getElementById("lyrsp6");                   
  obj.style.visibility= "visible";        
}

function hide_sponsr6()
{
  var obj = document.getElementById("lyrsp6");              
  obj.style.visibility= "hidden";        
}