IE4plus = (document.all) ? true : false;
NS4 = (document.layers) ? true : false;

function clickIE(){
	//return false;
}

function clickNS(e){
	if (e.which==2 || e.which==3) {
		//return false;
	}
}
if (!IE4plus) {
	document.captureEvents(Event.MOUSEDOWN || Event.MOUSEUP);
	document.onmousedown=clickNS;
	document.onmouseup= clickNS;
	document.oncontextmenu=clickIE; // For NS 6+
}else{
	document.onmouseup= clickIE;
	document.oncontextmenu=clickIE;
}