Enable Template/Block Hints in in Code magento

File: /app/code/core/Mage/Core/Block/Template.php (Magento 1.3.2)

public function getShowTemplateHints()
{
    if (is_null(self::$_showTemplateHints)) {
        self::$_showTemplateHints = Mage::getStoreConfig('dev/debug/template_hints')
            && Mage::helper('core')->isDevAllowed();
        self::$_showTemplateHintsBlocks = Mage::getStoreConfig('dev/debug/template_hints_blocks')
            && Mage::helper('core')->isDevAllowed();
    }
    return self::$_showTemplateHints;
}