Issue in custom delegate control

Question

hi 
 am  creating a custom delegate control with controlid ="AdditionalPageHead" . i deployed and activated as a  site collection feature.
but i am not sure how to see the activated control/  how to see this control in action.
below is my code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Administration;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.Diagnostics;
namespace OPUserDispName
  public  class EcmaScriptDelegateControl :WebControl
      protected override void OnLoad(EventArgs e)
          base.OnLoad(e);
          string helloAlert = "alert('Hello, world!');";
          this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "popup", helloAlert, true);
//          if(!HttpContext.Current.User.Identity.IsAuthenticated)
   //              return;
      //       SPUser user = //SPContext.Current.Web.EnsureUser("i:0#.f|OPMembership|OPAdmin");
   //          user.Name = "OPAdmin";
      //       user.Update();
in my  elements.xml file  of my module :
<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
    <Control Id="AdditionalPageHead" ControlAssembly="OPUserDispName, Version=1.0.0.0, Culture=neutral, PublicKeyToken=467af93481413beb" ControlClass="OPUserDispName.EcmaScriptDelegateControl"
></Control>
</Elements>
here i wanna see alert when the activated/or page load happened.
may i know, how to see this, in working. as per the current scenario, am unable to see any output even after feature activation. 
do i need to do any settings in master page? do i need to perform any changes in web.config.
help is appreciated!

Answer 1

This has complete solution.
http://www.codeproject.com/Articles/113704/SharePoint-Master-Page-Customizations-Through
can you try RegisterStartupScript instead
of RegisterClientScriptBlock?
Bala