function m_on(n){document.images["pt_" + n].src = "./top_img/menu_on.jpg";}
function m_off(n){document.images["pt_" + n].src = "./top_img/menu_off.jpg";}

lay = new Array("lay1","lay2","lay3","lay4","lay5","lay6","lay7","lay8")
function show(n) {
if (document.all)document.all(lay[n-1]).style.visibility = "visible"
else if (document.layers)document.layers[lay[n-1]].visibility = "visible"
else if ( document.getElementById )document.getElementById(lay[n-1]).style.visibility = "visible"
return false;
}
function hide(n) {
if (document.all)document.all(lay[n-1]).style.visibility = "hidden"
else if (document.layers)document.layers[lay[n-1]].visibility = "hidden"
else if ( document.getElementById )document.getElementById(lay[n-1]).style.visibility = "hidden"
return false;
}



function show_lay(x) {
document.getElementById(x).style.display = "block";
return false;
}

function hide_lay(x) {
document.getElementById(x).style.display = "none";
return false;
}