// JavaScript Document
function showlayer(id)
{//show the layer(n) with the layer id
var layer_id;
var xshow="";
layer_id=id;
xshow="document.getElementById('Layer"+layer_id+"').style.visibility='visible';";
eval(xshow);
}

//hide the layer(n) with the layer id 
function hiddenlayer(id)
{
var layer_id;
var xhidden="";
layer_id=id;
xhidden="document.getElementById('Layer"+layer_id+"').style.visibility='hidden';";
eval(xhidden);
}

function hidden_all(n)
{//hide all the layers 
var layer_num="";
var xl="";
var xm="";
var xr="";
var i="";
layer_num=n;
xl="document.getElementById('Layer";
xr="').style.visibility='hidden';";
for(i=1;i<=layer_num;i++)
	eval(xl+i+xr);
}