Since Joomla 1.6 is available as the stable version, more and more customers choose Joomla 1.6 version to built their webites.
On the other hand customers, who have their websites working with the previous Joomla 1.5 version, tend to migrate their CMS to the latest version for various reasons :)
Before you get started migrating from Joomla 1.5 to Joomla 1.6 first read the following instructions to get more familiar with the migrating process.
If some template styles depend on template's configuration, you have to set them to achieve a proper view.
To change template parameters navigate Extentions->Templates , then edit a template, which is set as a default one.