Now that he's finished with Star Wars: Episode III, George Lucas is turning his attention to Indiana Jones: Episode IV. A fourth film about the intrepid archaeologist has been on the drawing board for years, though producer Lucas has himself been a chief roadblock, having halted the project in early 2004 over his disapproval of the script by Frank Darabont (The Green Mile). But Variety reports that Lucas has approved the newest screenplay, by Jeff Nathanson, who wrote Catch Me If You Can and Terminal for Steven Spielberg. Spielberg, who has directed all the Indy movies, has also approved, Variety reports. Now, all that's needed is for Harrison Ford to say yes. Well, that, and for Spielberg to find time in his busy schedule. (He's got two movies on deck already, his drama about the aftermath of the terrorist attacks on Israeli athletes at the 1972 Olympics, and an Abraham Lincoln biopic that will star Liam Neeson.) If Ford likes Nathanson's script enough to dust off his fedora for the first time since 1989's Indiana Jones and the Last Crusade, the cameras still may not roll until well into 2006, when Ford will be 64. Indy's bullwhip may not be the only thing cracking.