Where is the Auto Check Feature on Mail Settings?

[superscientific]

On the "finger tips" video on the apple website there is an "auto check" setting on the settings part of the iphone. My push mail from Yahoo is sometimes working and sometimes not. I want to set it to check it at certain intervals of time.

Thanks

Danny

[richsim]

(Settings/Mail) below the list of accounts, as the first option under "Messages." If you have multiple accounts, this setting applies to all of them.

If you don't see it there, perhaps it doesn't appear for push mail accounts?