isNN=document.layers ? 1 : 0;function noContext(){return false;}

function noClick(e){if(isNN){if(e.which> 1){return false;}}else{if(event.button> 1){return false;}}}

if(isNN){document.captureEvents(Event.MOUSEDOWN);}

document.oncontextmenu=noContext;document.onmousedown  =noClick;document.onmouseup    =noClick;