GD library problem with PHP 4.3

[cfemocha]

Im trying to write a security image generator script for a registration form and I first wanted to test if GD library works.
I learnt that GD library comes with php 4.3, but when I tried phpinfo() GD setting is nowhere to be found.
Below are what I've tried so far:

[list]
[*]Execute “php –m” and “GD” module is found
[*]Uncomment the line extension=php_gd2.dll in php.ini
[*]Ensure that php_gd2.dll is in c:\php\extension directory.
[/list]

I tried the script below
[code]
<?php
$image = ImageCreate(200,150);
?>
[/code]

and got this error msg:   Fatal error:  Call to undefined function:  imagecreate()


I really don't know what else to try, please help!