Get the rendered HTML of your page and check the src of image control. Make sure that this image is available and accessible by directly entering it in the address bar.
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Response.Cookies["RFriend_PWD"].Value = ctlLogin.Password;
I could see a lot of problems in the code including but not limited to SQL Injection, Saving important data in cookies etc. Please read about Forms authentication, SQL injections etc before continuing with the above code.