var currlayerId = "text0";

function toglayer(id)
{
if(currlayerId) setdisplay(currlayerId, "none");
if(id)setdisplay(id, "block");


currlayerId = id;
}

function setdisplay(id,value)
{
var elm = document.getElementById(id);
elm.style.display = value;
}