function overlay() {
el = document.getElementById("overlay");
if (el.style.visibility == "visible") 
{
	el.style.visibility = "hidden";
	document.body.style.overflow='auto';
}
else 
{
	el.style.visibility = "visible";
	document.body.style.overflow='hidden';
}

el = document.getElementById("overlay1");
el.style.visibility = (el.style.visibility == "hidden") ? "visible" : "hidden";
}