function clickIE4() {
	if (event.button == 2) {
		return false;
	}
}

function clickNS4(e) {
	if (document.layers || document.getElementById && !document.all) {
		if (e.which == 2 || e.which == 3) {
			return false;
		}
	}
}

// only disable back button for pop-ups
if (opener) {
	if (document.layers) {
		document.captureEvents(Event.MOUSEDOWN);
		document.onmousedown = clickNS4;
	}
	else if (document.all && !document.getElementById) {
		document.onmousedown = clickIE4;
	}

	document.oncontextmenu = new Function("return false;")

	window.history.forward(1);
}