Where can you play hold'em online and buy in and out when ever you want?

Where can you play hold'em online and buy in and out when ever you want? Non tournament, style no limit.

Virtually anywhere it is called a ring game!

where's anywhere, you can't with pacific poker or party poker?

ummmmm Yes you can at both places.... Maybe you need to be a little bit more clear on what you are asking...

Are you referring to leaving the table and coming back?

I believe most sites will not let you leave with more than the max. table limit and return with less.

Example you are playing a NL table with a $25 buyin max and you get you stack up to $37 and want to leave. You decide to comeback within X minutes, you must sit down with the $37 you left with. I believe this is there so you can't pocket the $12 and comeback to only risk $25 again. It must be a gentlemen's rule.