这是我 Bootstrap Modal 的表单代码：

#myModal.modal.hide.fade{"tabindex" => "-1", role: "dialog", "aria-labellebdy" => "myModalLabel", "aria-hidden" => "true"}
    .modal-header
        %button{type:"button", class:"close", "data-dismiss" => "modal", "aria-hidden" => "true"} ×
        %h3#myModalLabel 创建新相册！
    .modal-body
        = simple_form_for [@user,@album], :html => {:multipart => true} do |f|
            = f.hidden_field :user_id
            .form-inputs
                = f.input :name
            .form-actions
                = f.button :submit
    .modal-footer
        %button{class:"btn", "data-dismiss" => "modal", "aria-hidden" => "true"} 关闭
        %button{class:"btn btn-primary"} 确认

问题是怎样用最先面的那个确认代替掉原来 Simple_form_for 里的那个 submit 呢？ 谢谢。