Charlie Sheen Negotiations in High Gear

5/17/2010 1:50 PM PDT

Charlie Sheen Negotiations in High Gear

Multiple sources tell TMZ offers and counteroffers have been flying back and forth on a possible new deal for Charlie Sheen on "Two and a Half Men," but the parties are still far apart.

One involved source says, "There have been seven offers.  We're going back and forth every 15 minutes."

Charlie's camp initially said they wanted a "2" in front of any offer -- meaning Charlie wanted at least $2 mil an episode for the next two years.  The source claims Warner Bros. "has gone up [from its initial offer] more than Charlie has gone down."

We're told if a deal is possible, it's likely it will be done either tonight or tomorrow morning.

No comment from Warner Bros.

The CBS upfronts -- where the network announces its fall schedule -- are Wednesday.

Stay tuned ...