Topic: Jquery, Rails and Drag and Drop

I ve make a complex form with nested forms, with railscats. I make a code with Jquery to make one of my textarea droppable and a list draggable

classical add_fields + drag and drop liste

function add_fields(link, association, content) {
    var new_id = new Date().getTime();
    var regexp = new RegExp("new_" + association, "g");
    $(link).parent().before(content.replace(regexp, new_id));


$(function() {
    $( "#liste" ).accordion({autoHeight: false,});

    $( "#liste li" ).draggable({
      appendTo: "body",
      helper: "clone",
      revert: true

      hoverClass: "ui-state-hover",
      accept: "#liste li",
      drop: function( event, ui ) {

when nested form is make with build in controller, that's work fine.
But the addition, with add_link, doesn't be droppable.

I know i need a bind() or live() or delegate() but which? where ? how ?

thanks for your help.