function doNothing() {
    return false;
}
document.oncontextmenu = doNothing;
document.ondragstart = doNothing;

/*if(document.layers) {
    window.captureEvents(Event.MOUSEDOWN);
    window.onmousedown = function(e) {if(e.target==document)return false;}
}
else document.onmousedown = function(){return false}
*/