[Call To Undefinded Function mysql_connect]

Hello,
when I installed php 5.1.2 in apache2 (and also in apache1.3, both on win 2000) I did steps you described. I would like to run gd2 and mysql extensions so I uncomment:
extension=php_gd2.dll
extension=php_mysql.dll

Now, when I starting apache2 (apache1.3 too), gd2 extension is running well, but when starting mysql extension there is error:

[b]Entering point mysql_real_espace_string procedure wasn't able to be found in dynamical joined libraryLIBMYSQL[/b]

After this error message apache write "couldn't load module c:\www\php\ext\pmp_mysql.dll" so I can't use mysql.

Do you know how to do it? Can you help me please?