ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false
function hide(id) {
if (document.getElementById) document.getElementById(id).style["visibility"] ="hidden"
else if (ns4) document.layers[id].visibility = "hide"
else if (ie4) document.all[id].style.visibility = "hidden"
}
function show(id) {
if (document.getElementById) document.getElementById(id).style["visibility"] ="visible"
else if (ns4) document.layers[id].visibility = "show"
else if (ie4) document.all[id].style.visibility = "visible"
}