Please check out this bug:

http://trac.symfony-project.org/ticket/4152

It appears that a fix has been committed somewhere for quite a while
but it's not in /branches/1.2. Also the patch that's been committed
doesn't really address the core issue, which is that when a confirm
attribute is present, link_to_function sets up a click handler with a
confirm call but doesn't actually unset confirm in html_options. The
end result is that a confirm attribute gets output in the HTML (which
is invalid), and Internet Explorer assumes that confirm attribute is
what you are trying to invoke when you call confirm(). A JavaScript
error ensues and the function fails entirely.

Calling window.confirm gets around the problem but the real fix is to
unset the confirm attribute after setting up the handler.

See my comments at the end of the bug for the one-line fix.

Simple bug, might go back several versions of Symfony - can we get
this one fixed?

Thanks!

-- 
Tom Boutell
P'unk Avenue
215 755 1330
punkave.com
window.punkave.com

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