var msg="Forbidden action! Property of Jenco Electronics!\n\n";

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