Fix Magento Theme for newest IE + Fix database issue

This project consists of 2 parts. - We have a custom theme that is giving problems with the newest internet explorer as you can see on [login to view URL] You should be able to fix this so the theme works fine in the newest IE again. Secondly. - We're having problems with an extension. This concerns this extension [login to view URL] The problem is the following: [login to view URL] We're looking for a real expert to fix this problem. We'd like to see the current version 1.4.2.0. upgraded to 1.5.1.0 without errors. We have a Magento multistore. There are daily sales so the site has to stay up and running. Needless to say that you're working professionally and that you make sure that during the project decent backups are made with every change. When the site should be down for the project that is only allowed between 01:00 and 6:50 (at night) Central European Time. Contact me if you have any questions. Only bid if you and your company are skilled enough.