function click() {
if ((event.button==2) || (event.button==3)) {
alert('¿À¸¥Âʸ¶¿ì½º »ç¿ë¾ÈµÊ.!!');
}
}
document.onmousedown=click
// --> 


<!-- Hide from old browsers
if (navigator.appName == "Netscape") {
document.captureEvents(Event.MOUSEDOWN)
document.onmousedown = checkClick

function checkClick(ev) {
        if (ev.which != 1) {
                alert('¿À¸¥Âʸ¶¿ì½º »ç¿ë¾ÈµÊ')
                return false
        }
}
}
// -->