the_permalink template

Hi,

I have a specific front page (custom template). Part of a content is static and at the end I show last three posts from category “news”. I also have a archive page where I collect all posts from a category “news”. My problem is “the_permalink”. Every time I click on a title (permalink) it always calls a front page (index.php).

How can I define which template should be used when permalink is clicked? For example if user clicks on a post title (permalink) show this whole post in a “post_template.php” file.

It is urgent, this site should already be published and this is the only this that holds me back. Thanks

[please don’t bump – rather post more information such as a link to the site.
if it is really urgent, consider to post a job, for instance at http://jobs.wordpress.net/ ]