I tried to make logon but unsuccessfully?

I tried to make logon but unsuccessfully?
How to make login on web page?
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Page without valid logon
http://www.slobodnadalmacija.hr/malioglasnik/oglasi.asp?Kategorija=57
content:
MAKARSKA, CENTAR, gara¾no mjesto 16 m2, prodajemo. Agencija TERRA
Makarska,
(kontakt podaci uz pretplatu ili u tiskanom izdanju)
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The same page with valid logon (user: "rosenthal", password: "pwdogrt428" )
has more information (telephone number, and date)
http://www.slobodnadalmacija.hr/malioglasnik/oglasi.asp?Kategorija=57
content:
MAKARSKA, CENTAR, gara¾no mjesto 16 m2, prodajemo. Agencija TERRA
Makarska,
tel. 021/613-575, mob. 098/225-280.
èetvrtak 30.3.2006 17:26:15 (527783)
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Thanks


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