right click blocking

var message="Function Disabled!";

function clickIE4(){
    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=clickIE4;
}

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