Upgrade Joomla from 1.5 to 2.5 and fix sejeal.jpg hack

We have a Joomla website still in 1.5. We have recently had the [login to view URL] hack, our website was taken down as a precaution. It is working now when typing directly into the bar but still has problems as a link from other sites. We want to have our site upgraded to Joomla 2.5 and if this alone does not fix the hack, any other necessary steps to be taken. The website is www. t e n n i s s s q u a [login to view URL] (remove the spaces). You can view the website to check any modules / components / plugins that need transferring to the new version. A full backup should be taken before the upgrade which should happen overnight UK time so that our clients do not miss the website. This is a simple job for the person with the right skills, we hope we can find them.