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; }
	}
}

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");