Hi,
This occurs because within the public_html folder you do not have an index file.
One solution is to install wordpress again within the public_html folder (not within a subfolder -wordpress-that is inside the public_html folder).
Another quick and easy solution is to redirect your visitors directly to your blog. This can be done by setting up a htaccess file in public folder(I don't know do it), or simply putting in the public_html folder a file index.php with the following code:
PHP Code:
<?php
header ("Location: http://homeworkopportunity.netai.net/wordpress/");
?>