string scriptstr = "\n window.parent.document.getElementById('upload').style.display='none'";
       scriptstr = scriptstr + "\n window.parent.document.getElementById('uploadinfo').style.display='block'";
       scriptstr = scriptstr + "\n window.parent.document.getElementById('show_upload').value='重新上传'";
       Page.ClientScript.RegisterStartupScript(this.GetType(), "OnInitControl", "<script language='JavaScript'type='text/javascript'>" + scriptstr + "\n</script>");
             
       this.GetType()//必传的参数，为本页面的类型。
       OnInitControl：//起的名字。
       scriptstr：在js中的方法。