function show_obj(obj_ID)
{
  if (document.getElementById) {
		document.getElementById(obj_ID).style.visibility ="visible";
	} else {
		if (document.layers) {
			document.layers[obj_ID].visibility = "show";
		} else {
			if (document.all) {
				document.all(obj_ID).style.visibility="visible";
			}
		}
	}

}

function hide_obj(obj_ID)
{

  if (document.getElementById) {
		document.getElementById(obj_ID).style.visibility ="hidden";
	} else {
		if (document.layers) {
			document.layers[obj_ID].visibility = "hidden";
		} else {
			if (document.all) {
				document.all(obj_ID).style.visibility="hidden";
			}
		}
	}
}