$(document).ready(function(){
	$(".la_reference_background").animate({ 
        opacity: 0.2,
      }, 650 );
	$("#liste_image_references > li > img").hover(
		function () {
			$(this).animate({ 
				opacity: 0.5,
				width: "125"
			}, 250 );
		}, 
		function () {
			$(this).animate({ 
				opacity: 1,
				width: "120"
			}, 250 );
		}
    );

});