After my own site was attacked this is great advice from 25yearsofprogramming.com (now offline). This article discusses how to prevent your site from getting hacked, how to repair a damaged site plus website security precautions.

Rinet IT had a problem where some images weren't being loaded for the drop down boxes on the front page. Using Firebug, an addon for Firefox (my favourite browser), the image link was OK but the image wasn't being displayed in a small box in Firebug like it normally does; very puzzling.

Move your Joomla website to its own folder on your web server. This is a good idea if you host more than one site from your hosting account.