Human error is to blame for an offensive link at Wal-Mart's Web site that recommended a film about the Rev. Martin Luther King Jr. to potential buyers of a ''Planet of the Apes'' DVD, the retail company said Friday.

The mistake resulted from a well-intentioned effort to promote a DVD about the black leader, said Carter Cast, president of walmart.com, the online shopping arm of Wal-Mart Stores Inc.

A business manager had grouped ''Martin Luther King: I Have a Dream'' with three other black-themed movies and assigned the package an overly broad category of DVD boxed sets, Cast said. So when an online visitor looked at a listing for the boxed DVD set ''Planet of the Apes: The Complete TV Series,'' the black-themed movies appeared under ''similar items.''

Cast said the display juxtaposition may have existed for the past year. Wal-Mart removed it from its Web site Thursday after learning about it from reporters. Wal-Mart apologized and shut down indefinitely its online system for referring shoppers to other movies.

Cast said there was no racist motivation. ''There was nobody here who maliciously put together that combination,'' Cast said by phone from walmart.com's headquarters in Brisbane, Calif. ''I know the person was well-intended in trying to get the 'I Have a Dream' speech out as a cross-sell.''

Walmart.com uses a different system than many other big online vendors to create cross-selling links.

Amazon.com, for example, bases recommendations on what a shopper has bought before and what other consumers who buy a certain item also purchased. Walmart.com manually assigns movies to specific ''item display groups,'' such as science fiction or African-American culture. The company's software then generates links guiding shoppers to other movies in that group.