颜色交替与按钮提示

private void dgrp_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
  {
if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
   {
    Label g=(Label)e.Item.Cells[1].FindControl ("group_id");
    gid=g.Text ;
    HyperLink in_mainLink = (HyperLink) e.Item.Cells[3].FindControl("in_mainlook");
    in_mainLink.NavigateUrl="../infor/in_mainDetail.aspx?pid="+pid+"&gid="+gid;
    in_mainLink.Attributes.Add("onclick","javascript:return confirm('确定要查看第" +gid+ "组?');");
//颜色交替  
    e.Item.Attributes.Add("onmouseover","this.style.backgroundColor='seashell'");
    if(e.Item.ItemType == ListItemType.Item)
    {
     e.Item.Attributes.Add("onmouseout", "this.style.backgroundColor='#ffffff'");
    }

    if(e.Item.ItemType ==ListItemType.AlternatingItem)
    {
     e.Item.Attributes.Add("onmouseout", "this.style.backgroundColor='#ffffff'");
    }
}