Steven Spielberg says he is happy to make a fifth Indiana Jones movie

Steven Spielberg has said he is prepared to make a fifth Indiana Jones movie if fans enjoy the long-awaited fourth film, Kingdom of the Crystal Skull.

The famed director, who is at the Cannes Film Festival in France with stars Harrison Ford, Cate Blanchett and Shia LaBeouf at the film's premiere, said he'd make another film "only if you want more.

"That's why we made this Indiana Jones. We'll certainly have our ear to the ground to hear what happens.

"That'll decide were we go from here," Spielberg added.

Reporters got to see the new film at an official screening ahead of the premiere.

The BBC's film critic said the film -- the first Indiana Jones movie in 19 years -- was "very much in the style of the first three films," adding that "the set-piece stunts are second to none." The movie critic for British magazine Empire said it was "a slick, fun film", while the Daily Telegraph's David Gritten called it "undeniably creaky".

But despite the mixed reviews, the film's leading man, Harrison Ford, remains un-fazed by the critics.

"I expect to have the whip turned on me. It is not unusual for something that is popular to be disdained by some people and I fully expect it," he said.

"I'm not really worried about it. I work for the people who pay to get in -- they are my customers.

"My focus is on providing the best experience I can for those people."

Ford, 65, who made his debut in the role in 1981's Raiders of the Lost Ark, described the new film as a "celebration of the movies".

He added that he was delighted to see it create such a stir at Cannes, with fans holding up signs saying "need Indy ticket".

"I'm delighted that we have the opportunity to release a film now because for a couple of generations, young people have just been seeing this on DVD at home," he said.

"Now we get the chance to see it in the cinema, where it's meant to be seen. I'm very excited about that."

The film opens in 1957 at the height of the Cold War, and that the hero is on the search for a solid gold skull stolen from a lost city and guarded by the living dead.

Spielberg tried to make the film using old-fashioned B-movie techniques, rather than computer graphics, in keeping with the original trilogy.

Scenes in the trailer show Ford make a joking reference to his age.

"This isn't as easy as I remember," he quips.

The film is scheduled for a worldwide release on May 22, 2008