customizing error messages from form helper

two questions--

the default class returned from error() within the html helper is
error-message. how do i override this in my controller?

more importantly, how can i inject some html content inside the error div
after a failed form validation?

right now its:

<div class="error-message">error message here</div>

i would like it to hypothetically be:

<div class="error-message"><div class="nested-div">error message
here</div></div>

is this possible sanely?

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