Autocomplete in Yahoo email & Safari 3.0?

Using Safari 3.0 and going to yahoo email. When I begin typing the address in the "To:" field, I get no autocomplete help. This is not the case when I use Firefox as my OS X browser, only Safari. Autofill boxes are all checked...it doesn't make a difference.

Is there a workaround here? Using Firefox isn't a big deal, but I'd like the Safari option, and the ability to get autocomplete to work. Any thoughts? Thanks.

I updated to 3.1 and now in Yahoo email, when I start typing an address in my contacts in the "To:" field it does autocomplete. But it only works for a single email address; it won't do autocomplete for multiple addresses in the "To:" field, only the first.

In Firefox, I get autocomplete help with multiple addresses. What's up with Safari? Any other suggestions on how to get it to do what Firefox does?