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;