mysql / php5 configuration

im using win xp and installed apache 2.x and php5...both working fine.
when i test:
>
<?php
phpinfo();
?>
>
it works fine. trouble starts when i started installing mysql 4.x
server on the same machine. mysql run successfully but the issue is i
cant integrate it with php. i already copied -- php_mysql.dll on my
\php\ext and libmysql.dll on \php as well as on \windows\system32.
>
also i made necessary changes on php.ini, but when i run :
>
<?php
mysql_connect("localhost","root","123") or die("cannot connect");
?>
>
it's not working. what could have gone wrong?
>
>

actually there's no error msg..it just gave me blank page.
>
<?php
mysql_connect("localhost","root","123") or die("cannot connect");
echo'ok';
?>
>
even the work "ok" is not showing either. im wondering, if my password
or username, or the host is wrong it should give me the msg "cannot
connect", but there's nothing. and if i restart apache, no error msgs
also.
>

actually there's no error msg..it just gave me blank page.
>
<?php
mysql_connect("localhost","root","123") or die("cannot connect");
echo'ok';
?>
>
even the work "ok" is not showing either. im wondering, if my password
or username, or the host is wrong it should give me the msg "cannot
connect", but there's nothing. and if i restart apache, no error msgs
also.
>
>

im using win xp and installed apache 2.x and php5...both working fine.
when i test:
>
<?php
phpinfo();
?>
>
it works fine. trouble starts when i started installing mysql 4.x server
on the same machine. mysql run successfully but the issue is i cant
integrate it with php. i already copied -- php_mysql.dll on my \php\ext
and libmysql.dll on \php as well as on \windows\system32.
>
also i made necessary changes on php.ini, but when i run :
>
<?php
mysql_connect("localhost","root","123") or die("cannot connect");
?>
>
it's not working. what could have gone wrong?