function cancelEvent(){
	window.event.returnValue = false;
}

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");