function slideShow(slide,nbTotal) {

	    for(i=1;i<(nbTotal+1);i++)
			if( i==slide )
				document.getElementById('slide'+i).style.display = "block";
			else
				document.getElementById('slide'+i).style.display = "none";
	}

	function slideShowPeople(slide,nbTotal) {

	    for(i=0;i<(nbTotal+1);i++)
			if( i==slide )
				document.getElementById('slide'+i).style.display = "block";
			else
				document.getElementById('slide'+i).style.display = "none";
	}

	function slideShowDouble(slide,nbTotal) {

	    for(i=0;i<(nbTotal+1);i++)
			if( i==slide )
			{
				document.getElementById('image'+i).style.display = "block";
				document.getElementById('slide'+i).style.display = "block";
			}
			else
			{
				document.getElementById('image'+i).style.display = "none";
				document.getElementById('slide'+i).style.display = "none";
			}
	}

	function prec(nbTotal){

		for(i=1;i<(nbTotal+1);i++)
			if( document.getElementById('slide'+i).style.display == "block" )
				if( i==1 ) show = nbTotal;
				else show = i-1;
		slideShow(show,nbTotal);
	}

	function suiv(nbTotal){

		for(i=1;i<(nbTotal+1);i++)
			if( document.getElementById('slide'+i).style.display == "block" )
				if( i==nbTotal ) show = 1;
				else show = i+1;
		slideShow(show,nbTotal);
	}