function hidden()
{
document.getElementById("engLayer1").style.visibility = "hidden"
document.getElementById("engLayer2").style.visibility = "hidden"
document.getElementById("engLayer3").style.visibility = "hidden"
document.getElementById("engLayer4").style.visibility = "hidden"
document.getElementById("engLayer5").style.visibility = "hidden"
document.getElementById("engLayer6").style.visibility = "hidden"
document.getElementById("engLayer7").style.visibility = "hidden"
document.getElementById("engLayer8").style.visibility = "hidden"
document.getElementById("engLayer9").style.visibility = "hidden"
document.getElementById("engLayer10").style.visibility = "hidden"
document.getElementById("engLayer11").style.visibility = "hidden"
document.getElementById("engLayer12").style.visibility = "hidden"
document.getElementById("engLayer13").style.visibility = "hidden"
}
function show(layerid)
{
hidden()
document.getElementById(layerid).style.visibility = "visible"
}