Magento offers the web master to put static contents where ever he likes in the site with the help of CMS -> Static Blocks.
These blocks can be easily edited from the admin panel.
To call and show their contents on any phtml file write the following code.
echo $this->getLayout()->createBlock('cms/block')->setBlockId('identifier')->toHtml() ;
Here identifier should be replaced by the identifier of the static block.
Njoy 🙂