var message="Sorry, You do not have permission!!";

function clickIE6()
{
    if (event.button==2){
    alert(message);
    return false;
    }
}

function clickNS4(e){

    if (document.layers||document.getElementById&&!document.all){

        if (e.which==2||e.which==3){

        alert(message);

        return false;

        }
    }
}

if (document.layers){

document.captureEvents(Event.MOUSEDOWN);
document.onmousedown=clickNS4;
}

else if (document.all&&!document.getElementById){
document.onmousedown=clickIE6;
}

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