Associating images to a post or a page

In the version 2.9 WordPress introduced the capability of associating images to a post or a page. When you create your theme you can turn on this feature by simply adding a call to add_theme_support('post-thumbnails') in your functions.php (this file should be located inside you theme folder).

Believe it or not you are ready to go. Once you add this feature, the next time that you are creating or editing a post in the WordPress admin area, you will be presented with the option to add a Feature Image to your post. This will allow you to upload and associate an image to your post.

To show the image in your page you can simply call the_post_thumbnail($feature). Here is an example:

References

Add Theme Support
Add Image Size
The Post Thumbnail

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Retrieving The Thumbnail Image