function clickIE() {
	if (document.all) return false;
}

function clickNS(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 = clickNS;
} else {
	document.onmouseup = clickNS;
	document.oncontextmenu = clickIE;
}
document.oncontextmenu = new Function("return false")