function System() {	
	
	if(!System._single) {
		//OS
		if(-1 != navigator.userAgent.indexOf('Windows NT 5.0')) {
			this.os = System.WIN_2000;
		} else if(-1 != navigator.userAgent.indexOf('Windows NT 5.1')) {
			this.os = System.WIN_XP;
		} else if(-1 != navigator.userAgent.indexOf('Windows NT 6.0')) {
			this.os = System.WIN_VISTA;
		} else if(-1 != navigator.userAgent.indexOf('Windows NT 6.1')) {
			this.os = System.WIN_7;
		} else if(-1 != navigator.userAgent.indexOf('Mac OS X')) {
			this.os = System.MAC_OS_X;
		} else {
			this.os = System.OTHER;
		}
		
	
		//Navigateur
		if(-1 != navigator.userAgent.indexOf('MSIE')) {
			this.navigator = System.IE;
		} else if(-1 != navigator.userAgent.indexOf('Firefox')) {
			this.navigator = System.FIREFOX;
		} else if(-1 != navigator.userAgent.indexOf('Opera')) {
			this.navigator = System.OPERA;
		} else if(-1 != navigator.userAgent.indexOf('Chrome')) {
			this.navigator = System.CHROME;
		} else if(-1 != navigator.userAgent.indexOf('Safari')) {
			this.navigator = System.SAFARI;
		} else {
			this.navigator = System.OTHER;
		}
		
		
		//Plugins
		this.quicktime = false;
		this.firefoxPlugin = false;
		this.mplayerPlugin = false;

		if(navigator.plugins.length == 0){
	    //alert('p');	    
	   }else{
	    
	  	  //Détection des plugins installés
	  	  var lFileName = '';
	  	  
	  	  
	  	  
	  	  for(i=0; i < navigator.plugins.length; i++)
	  	  {
	  	  	//alert(navigator.plugins[i].filename);
	  	  		  	
	  	  	lFileName = navigator.plugins[i].filename.toLowerCase();
	  	  	                        	  	  	
	  	  	if(lFileName.indexOf('quicktime') > -1 ){
 	  	  		this.quicktime = true;
	  	  	}else if(lFileName.indexOf('np-mswmp.dll') > -1){
	  	  		this.firefoxPlugin = true;	   		
	  	  	}else if(lFileName.indexOf('npqtplugin.dll') > -1){
	  	  		this.quicktime = true;	   		
	  	  	}
	  	  
	  	 }
	    
	    }			
		
		System._single = this;	
			
	} else {
		;
	}
	
	return System._single;
}

System._single = null;
/*System.prototype.os = null;
System.prototype.navigator = null;

System.prototype.quicktime = null;
System.prototype.firefoxPlugin = null;
System.prototype.mplayerPlugin = null;*/


System.OTHER = 1;

System.WIN_2000 = 100;
System.WIN_XP = 101;
System.WIN_VISTA = 102;
System.MAC_OS_X = 103;
System.WIN_7 = 104;


System.IE = 200;
System.FIREFOX = 201;
System.OPERA = 202;
System.SAFARI = 203; 
System.CHROME = 204;