$(document).ready(function(){
  var current = $(".current");
  var taille_max = 441; //max width
  var taille_min = 60; //min width
  $("#accordeon ul li a").hover(function() {
    $(current).animate({width: taille_min}, { queue:false, duration:400 });
	$(this).animate({width: taille_max}, { queue:false, duration: 400});
	current = this;
  });
});