am = "Sorry no Right Clicks please ...";

bV  = parseInt(navigator.appVersion)
bNS = navigator.appName=="Netscape"
bIE = navigator.appName=="Microsoft Internet Explorer"

function nrc(e) 
{
   if (bNS && e.which > 1)
	{
      		alert(am)
      		return false
   	} 
	
	else if (bIE && (event.button >1)) 
	{
     		alert(am)     
		return false;
   	}
}

document.onmousedown = nrc;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
if (bNS && bV<5) window.onmousedown = nrc;