With Bootstrap 2, we've simplified the base class: .alert instead of .alert-message. We've also reduced the minimum required markup—no <p> is required by default, just the outter <div>.
For a more durable component with less code, we've removed the differentiating look for block alerts, messages that com with more padding and typically more text. The class also has changed to .alert-block.
For a more durable component with less code, we've removed the differentiating look for block alerts, messages that come with more padding and typically more text. The class also has changed to .alert-block.
Bootstrap comes with a great jQuery plugin that supports alert messages, making dismissing them quick and easy.