function click(e){
if (document.all) 
if (event.button == 2) return false;
if
(document.layers) 
if (e.which == 3) return false;
}
function click2(){
event.returnValue=false;return false;
}
if (document.layers)
document.captureEvents(Event.MOUSEDOWN);
document.onmousedown=click;
document.oncontextmenu=click2;