function clickIE4(){
if (event.button==2){
return false;
}
}


function clickNS4(e){
if (document.layers||document.getElementById&&!document.all){
if (e.which==2||e.which==3){
return false;
}
}
}

if (document.layers){
document.captureEvents(Event.MOUSEDOWN);
document.onmousedown=clickNS4;
}
else if (document.all&&!document.getElementById){
document.onmousedown=clickIE4;
}

document.oncontextmenu=new Function("return false");

if (document.all)
  document.onselectstart =
    function () { return false; };

// Netscape 6:
//document.onmousedown = function () { return false; };