function changeAffichage(type){
			var valeur =  "ajax=1&type_aff="+type;
			if($('save_recherche')) valeur += '&'+$('save_recherche').value;
			 new Effect.Fade('toutes_annonces', { // the id of the <DIV> containing the photos 
			  to: 0.1, 
			  duration: 1, 
			  fps: 50, 
			  afterFinish: function() { 
				new Ajax.Updater('toutes_annonces', '/ajax/change_affichage.php', { // URL for next <IMG> tag 
				  asynchronous: true, 
				  parameters:valeur,
				  method:'get',
				  onSuccess: function() {	
					new Effect.Appear('toutes_annonces', {
					  from:0.1,
					  duration: 1,
					  fps: 50,
					  queue:'end',
					  afterFinish: function(){

					  }
					})
				  } 
				}) 
			  } 
			})
		}