Magento notification types

There are few “notification types” in Magento you can utilize:

• error
  Mage::getSingleton(‘core/session’)->addError(‘Custom error here’);
• warning
  Mage::getSingleton(‘core/session’)->addWarning(‘Custom warning here’);
• notice
  Mage::getSingleton(‘core/session’)->addNotice(‘Custom notice here’);
• success
  Mage::getSingleton(‘core/session’)->addSuccess(‘Custom success here’);