cookies working in IE but not in mozila firefox

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ASP

hi...
the following code is working properly for IE but its not working in Mozilla Firefox...after closing browser cookies values are getting destroyd

If RememberMe = "Yes" Then
            if(companyFormultiDB <> "") then
                Response.Cookies("User")("AccNo") = companyFormultiDB            end if
            if(login_Email <> "") then
                Response.Cookies("User")("Email") = login_Email            end if
            if(login_Password <> "") then
                Response.Cookies("User")("Password") = login_Password            end if
            Response.Cookies("User").Expires =  Now() + LoginCookieExpireTime  '' LoginCookieExpireTime can be set in web.config            'Response.Cookies("User").Expires =  "2009/12/31" 'TOCHANGE TO DATEDADD  + 30days
        Else
            Response.Cookies("User")("Email") = ""
            Response.Cookies("User")("Password") = ""
            Response.Cookies("User")("AccNo") = ""
            'Response.Cookies("User").Expires =  Now() + LoginCookieExpireTime  '' LoginCookieExpireTime can be set in web.config        End If


"vb">If UCase(Request.ServerVariables("REQUEST_METHOD")) = "POST" Then
    Dim svd_AccNo : svd_AccNo = Request.Cookies("User")("AccNo")   ' Dim svd_AccNo : svd_AccNo = Server.HTMLEncode(Request.Form("AccNo"))    Dim svd_Email : svd_Email = Server.HTMLEncode(Request.Form("username"))    'Dim svd_Email : svd_Email = Request.Cookies("User")("Email")    Dim svd_Password : svd_Password = Server.HTMLEncode(Request.Form("password"))    Dim svd_RememberMe : svd_RememberMe = Server.HTMLEncode(Request.Form("chkRemember"))    If svd_RememberMe = "Yes" Then
        svd_RememberMe = "checked"
    End If
Else
    svd_Email = Request.Cookies("User")("Email")        response.Write(svd_Email)    svd_Password = Request.Cookies("User")("Password")    svd_AccNo = Request.Cookies("User")("AccNo")    If Not svd_Email = "" AND Not svd_AccNo = "" Then
        svd_RememberMe = "checked"
    End If
End If