gistfile1.js

    jQuery(document).ready(function($){

        var _custom_media = true,
                _orig_send_attachment = wp.media.editor.send.attachment;

        $('#myMediaArea').click(function(e) {
            var send_attachment_bkp = wp.media.editor.send.attachment;
            var button = $(this);
            var id = button.attr('id').replace('_button', '');
            _custom_media = true;
            wp.media.editor.send.attachment = function(props, attachment){
                if ( _custom_media ) {
                    $("#" + id).val(attachment.url);
                } else {
                    return _orig_send_attachment.apply( this, [props, attachment] );
                }
            };
            wp.media.editor.open(button);
            return false;
        });
        $('.add_media').on('click', function(){
            _custom_media = false;
        });
    });