using System.Text;StringBuilder strb=new StringBuilder();
strb.Append("<script language='javascript'>");
strb.Append("function Page_onLoad() { viewdat=window.open('viewdat_t.aspx?id="+request("id")+"','_blank');history.go(-1);viewdat.focus();return;}window.onload=Page_onLoad()
strb.Append("</script>");
Page.RegisterStartupScript("Startup",strb.ToString());