function visi(id,sens,racine,nb)
	{

		if(!nb) nb= 7;
		for(i=1;i<=nb;i++)
		{
			if(i==id)
				visible = 1;
			else
				visible = 0;

			targetElement = document.getElementById(racine+"_"+i) ;
			if(targetElement)
			if(visible)
				targetElement.className = "actif" ;
			else
				targetElement.className = "" ;
		}
		
	}