var isNS = (navigator.appName == "Netscape") ? 1 : 0;
if(isNS) document.captureEvents(Event.MOUSEDOWN||Event.MOUSEUP);
function mischandler(){return false;}
function mousehandler(e){return false;}
document.oncontextmenu = mischandler;
document.onmousedown = mousehandler;
document.onmouseup = mousehandler;