function ouvrepopup(varnomfichier,nom,largeur,hauteur)
		{
			vnewpopup=window.open(varnomfichier,nom,'toolbar=0, location=0, directories=0, status=0, scrollbars=1, resizable=1, copyhistory=0, menuBar=0,width='+largeur+',height='+hauteur+',top=0,left=0');
			vnewpopup.focus();

		} 
				
		
		
		function swap(nom_image,objet_graphique)
		{
			i=-1;
			do
			{
				i++;
			} while ( window.document.images[i].name!=nom_image )
				window.document.images[i].src =objet_graphique.src;
		}
		
		
		
		
		function banniere1(nbimage,imagedepart)
		{
			numimage= Math.round(Math.random()*(nbimage-1)+1)+imagedepart;
			url = "../image/banniere";
			url=url+numimage+".jpg"
			window.document.images.banniere.src =url;
			setTimeout("banniere1("+nbimage+","+imagedepart+")",4000);
		}

		function banniere2(nbimage,imagedepart)
		{
			numimage= Math.round(Math.random()*(nbimage-1)+1)+imagedepart;
			url = "../image/largesp";
			url=url+numimage+".jpg"
			window.document.images.session1.src =url;
			setTimeout("banniere2("+nbimage+","+imagedepart+")",4000);
		}