var lay_vis=false;
function view_sub(layer)
{
    layer_new = document.getElementById(layer);
    layer_new.style.visibility='visible';
    layer_new.style.display='block';
}
function close_sub(layer)
{
    layer_new = document.getElementById(layer);
    layer_new.style.visibility='hidden';
    layer_new.style.display='none';
}