O.J. heard ranting on tape at robbery trial at Paul Swan

LAS VEGAS, Nevada (CNN) — O.J. Simpson’s angry voice rang out in a Las Vegas courtroom Monday achat cialis as a prosecutor opened the former gridiron great’s armed robbery trial by playing an audiotape of the hotel room confrontation at the heart of the case.

Judge Jackie Glass vows to keep references to Simpson's murder trial and civil cases out of the robbery trial.

O.J. Simpson could face life behind bars if convicted of the most serious charges.

The profanity-laced tirade, on one of several audiotapes that will be played for jury, opened the trial of Simpson and co-defendant Clarence "C.J." Stewart.

Defense attorney Yale Galanter acknowledged that Simpson was emotional about personal property that had been stolen from his home years earlier.

He said the evidence will show that Simpson had no intent to commit a crime.

"This was a recovery," Galanter said, &quot levitra kaufen;not a robbery."

But Chief Deputy District Attorney Chris Owens told jurors the audiotape and others reveal "the two faces of Orenthal James Simpson." One is his amiable public persona. The other is the angry, ranting, profane man Owens says is heard on the tape.

The prosecutor pointed out that the key players in the case were used to taping their business dealings.

Earlier, Simpson smiled and gave a thumbs up as he entered the Clark County Regional Justice Center.

Watch O.J.’s entrance »

The customary clutch of eccentric onlookers for all things O.J. seemed to evaporate in the 100-degree Las Vegas heat. The cast of characters dwindled to a wheelchair-bound man in a sequined Santa Claus outfit and single, loquacious demonstrator with a bullhorn.

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Media interest in Simpson also seems to have waned. The sprawling media village that sprung up for Simpson’s preliminary hearing looked to be two thirds smaller, with some parking spaces available.

Witnesses say Simpson and five men burst into a Las Vegas hotel room brandishing guns on September 13, 2007.