<!-- Begin
function setVisible1( setting )
{
var myElement = document.getElementById("layer1");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible2( setting )
{
var myElement = document.getElementById("layer2");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible3( setting )
{
var myElement = document.getElementById("layer3");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible4( setting )
{
var myElement = document.getElementById("layer4");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible5( setting )
{
var myElement = document.getElementById("layer5");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible6( setting )
{
var myElement = document.getElementById("layer6");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible7( setting )
{
var myElement = document.getElementById("layer7");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible8( setting )
{
var myElement = document.getElementById("layer8");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible9( setting )
{
var myElement = document.getElementById("layer9");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible10( setting )
{
var myElement = document.getElementById("layer10");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible11( setting )
{
var myElement = document.getElementById("layer11");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible12( setting )
{
var myElement = document.getElementById("layer12");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible13( setting )
{
var myElement = document.getElementById("layer13");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible14( setting )
{
var myElement = document.getElementById("layer14");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible15( setting )
{
var myElement = document.getElementById("layer15");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible16( setting )
{
var myElement = document.getElementById("layer16");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible17( setting )
{
var myElement = document.getElementById("layer17");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible18( setting )
{
var myElement = document.getElementById("layer18");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible19( setting )
{
var myElement = document.getElementById("layer19");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}

function setVisible20( setting )
{
var myElement = document.getElementById("layer20");

if(setting)
        myElement.style.visibility="visible";
else
        myElement.style.visibility="hidden";
}
// End -->