function show(mylayer) {
	if (isNS4) {
		document[mylayer].visibility = "visible";
	}
	else if (isIE4 || isIE5) {
		document.all[mylayer].style.visibility = "visible";
	}
	else {
		document.getElementById(mylayer).style.visibility = "visible";
	}
}

function hide(mylayer) {

	if (isNS4) {
		document[mylayer].visibility = "hidden";
	}
	else if (isIE4 || isIE5) {
		document.all[mylayer].style.visibility = "hidden";
	}
	else {
		document.getElementById(mylayer).style.visibility = "hidden";
	}
}