后台动态生成<input>按钮，想实现删除功能！！！！

这是一个上传按钮的事件，如何在其中的Literal1，Literal2，Literal3中获得
<input id='delete' type='button' runat='server' value='删除' />按钮，并实现删除
FileUpload1上传的附件？？？？(提示：点上传时已经调用FileUpload1.PostedFile.SaveAs（）方法上传到服务器了，所以要删除的话不光要删除页面的，还要删除upload文件夹下已上传的附件)
protected void 上传_Click(object sender, EventArgs e)
    {
        if (FileUpload1.PostedFile.FileName.Trim() != "")
        {
            //上传文件
            string fileName = FileUpload1.FileName;//获取文件名
            string type = (fileName.Substring(fileName.LastIndexOf(".") + 1)).ToLower();//获取上传文件的类型
            //判断文件类型
            if ((type == "jpg" || type == "jpeg" || type == "gif" || type == "png" || type == "swf" || type == "rar" || type == "zip") && FileUpload1.PostedFile.ContentLength < 2 * 1024 * 1024)
            {
                //计数器
                ViewState["count"] = ViewState["count"] == null ? "0" : ViewState["count"];
                if (ViewState["count"].ToString() == "5")
                {
                    Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('一次最多上传5个附件！')</script>");
                    return;
                }
                string path = Server.MapPath("upload");
                fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + "." + type;
                this.FileUpload1.PostedFile.SaveAs(path + "\\" + fileName);
                if (type == "jpg" || type == "jpeg" || type == "gif" || type == "png")
                {
                    ViewState["count"] = int.Parse(ViewState["count"].ToString()) + 1;
                    if ((int.Parse(ViewState["count"].ToString()) % 3) == 0)
                    {
                        Literal1.Text += "<br/>";
                    }
                    Literal1.Text += "<a href='#' onclick=\"window.showModalDialog('Img.htm?img=upload/" + fileName + "','','dialogWidth=75;dialogHeight=50;help=0;status=0;resizable=1')\"><img src='upload/" + fileName + "' width='25px' height='25' border=0 />" + fileName + "</a>&nbsp;<input id='delete' type='button' runat='server' value='删除' />";
                    Hidden1.Value += "upload/" + fileName + ",";
                }
                if (type == "rar" || type == "zip")
                {
                    ViewState["count"] = int.Parse(ViewState["count"].ToString()) + 1;
                    if ((int.Parse(ViewState["count"].ToString()) % 3) == 0)
                    {
                        Literal2.Text += "<br/>";
                    }
                    Literal2.Text += "<img src='images/yasuo.jpg' width='25px' height='25' border=0 />" + fileName + "&nbsp;<input id='delete' type='button' runat='server' value='删除' />";
                    Hidden1.Value += "upload/" + fileName + ",";
                }
                if (type == "swf")
                {
                    ViewState["count"] = int.Parse(ViewState["count"].ToString()) + 1;
                    if ((int.Parse(ViewState["count"].ToString()) % 3) == 0)
                    {
                        Literal3.Text += "<br/>";
                    }
                    Literal3.Text += "<img src='images/flash.jpg' width='25px' height='25' border=0 />" + fileName + "&nbsp;<input id='delete' type='button' runat='server' value='删除' />";
                    Hidden1.Value += "upload/" + fileName + ",";
                }
            }//文件类型if
            else
            {
                Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('文件类型不符！！')</script>");
            }
        }//文件是否为空if
        else
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('请选择文件！！')</script>");
        }
    }