var message = "" // leave this empty for no alter message.

var nIsIE4 = (document.all&&!document.getElementById)? 1:0
var nIsNS6 = (navigator.productSub<20011019)? 1:0 
var nIsNS4 = (navigator.appName.toLowerCase()=="netscape"&&parseInt(navigator.appVersion)==4)? 1:0

function DisableRightClick(e){
	if((nIsIE4&&event.button==2)||((nIsNS4||nIsNS6)&&(e.which==2||e.which==3))){
 		if(nIsIE4&&!message) message=""
			if(message) alert(message)
			return false
}
}

	if(nIsIE4||nIsNS4){
		if(nIsNS4) document.captureEvents(Event.MOUSEDOWN)
			document.onmousedown = DisableRightClick
} 
		else if(nIsNS6) document.onmouseup = DisableRightClick
			document.oncontextmenu = new Function("if(message)alert(message);return false")