1. Set Your Message.
Mage::getSingleton("core/session")->addSuccess("Add success message");
Mage::getSingleton("core/session")->addError("Please login");
Mage::getSingleton("core/session")->addNotice("Add notification message");
2. Display Your Message Wherever You Want.(Optional If use custom Extension Or not Defined)
<?php echo $this->getChildHtml('global_messages'); ?>
3. Define Block in Layout. (Optional If use custom Extension Or not Defined)
<block type="core/messages" name="global_messages" as="global_messages"/>
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