oscommerce bug removal

Hi, Urgent help required to remove some bugs from our OScommerce store. We have had some upgrades and optimisation carried out but are still coming across a few problems that are causing difficulties, (our site [login to view URL]) and need someone to sort it out right away as the site is live. In a nutshell when products are entered into admin in a certain category and then copied (not duplicated) to other catagories they do not show up everywhere they are supposed to, in addition some images do not show at all and certain thumbnail images do not open giving an error message " the requested content cannot be loaded, please try later" so it appears there is a problem with the image cache too. We need a reliable programmer for future projects, so although these may be relatively easy fixes, please enter your best bid to get us out of the mire and yourselves inline for further more profitable future projects. Excellent and regular communication required please.