var TypeVoiceNav = 0 ; // ActiveX<->1 Plugin<->2

var IE        = (navigator.appName.indexOf("Microsoft") != -1) ;
var Win32     = (navigator.platform.indexOf("Win") != -1) ;
var VersionOK = (navigator.userAgent.indexOf("Mozilla/3")==-1 && navigator.userAgent.indexOf("Mozilla/2")==-1) ;
var Opera	  = (navigator.userAgent.indexOf("Opera") != -1) ;

//Détermine le type du système VoiceNav
if (Win32 && VersionOK)	TypeVoiceNav = (IE && !Opera)? 1 : 2 ;