function navigateur() {
	var nav_name = navigator.appName;
	var nav_version = navigator.appVersion;
	this.ns = (nav_name.indexOf("Netscape",0 )!=-1)?true:false;
	this.ie = (nav_name.indexOf("Microsoft",0)!=-1)?true:false;	
	
	if (this.ie) this.version = ( nav_version.indexOf("MSIE 5.5",0)!=-1 )?5.5:0;
	if (this.ns) this.version = parseInt(navigator.appVersion);	
}

nav = new navigateur();