Automatically post website content to facebook page

My client has a Drupal website and wants to automatically push content to its facebook fan page after the content is published on the website. Currently we are using RSS Graffiti, which gets the job done, but if you can provide us a script that can be uploaded to our server, so that we won't have to use 3rd party software that would be great. If you don't know Drupal, that's not a problem, as I can do pretty much everything on the Drupal side (setting up rss feed, adding the og meta tags, etc.) but I need help with communicating with Facebook. Please note that we are using cron to publish content, so no cookies and/or session variables can be used, the process has to be 100% automatic, without any user interaction. This is a good example of RSS Graffiti: [login to view URL] The script should be able to post to a page like that. Also please let me know if it is possible to increase the size of the images. My budget is 30$-45$ for this project. I hope it's fairly easy for someone who has already done this.