javascript操纵CheckBox实现GridView选中行变色

javascript代码：

  <script language="javascript" type="text/javascript">
   function checkme(obj,rowid)
   {
     if(obj.checked)
     {
      rowid.style.backgroundColor='silver';
      }
      else
     {
      rowid.style.backgroundColor='';
     }
    }
    </script>

后台主要代码：

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;

public partial class Default10 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindGridView();
        }
    }

    private void BindGridView()
    {
        SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["Personal"].ConnectionString);
        conn.Open();
        SqlDataAdapter adp = new SqlDataAdapter("select [id],[name] from [information]", conn);
        DataSet dataset = new DataSet();
        adp.Fill(dataset, "information");
        conn.Close();
        GridView1.DataSource = dataset;
        GridView1.DataKeyNames = new string[] { "id" };
        GridView1.DataBind();
        for (int i = 0; i < GridView1.Rows.Count; i++)
        {
            CheckBox chbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
            GridView1.Rows[i].Attributes.Add("id", "row" + i.ToString());
            chbox.Attributes.Add("onclick", "checkme(this,row" + i.ToString() + ");");
        }
    }
}

只适用于GridView行背景没有设置颜色的操作！！！
没有考虑当GridView行中原本有颜色时怎样实现恢复原来颜色