// ºê¶ó¿ìÀú üũ
if (navigator.appName == "Netscape") // NS
{
	document.captureEvents(Event.MOUSEDOWN)
	document.onmousedown = noRight

	function noRight(ev) 
	{
		if (ev.which != 1) 
		{
			alert('You can not use the right button of the mouse.');
			return false;
		}
	}
}
else // IE
{
	function noRight()
	{
		if ((event.button==2) || (event.button==3)) 
		{
			alert('You can not use the right button of the mouse.');
		}
	}

	document.onmousedown=noRight;
}