AvatarIf you saw 'Avatar' on Martin Luther King Day, you may have bought the ticket that pushed James Cameron's freshly-crowned Golden Globe winner over the $500 million mark in domestic box office. And you would have helped it become the fastest movie in history to hit that mark, a mere 32 days.

'Avatar's' next big target: the $601 million domestic gross of Cameron's 'Titanic' in 1998. Once thought impossible, 'Avatar's' takedown of its elder sibling is now inevitable. img hspace="4" vspace="4" border="1" align="right" src="http://www.blogcdn.com/blog.moviefone.com/media/2010/01/avatar-20th-century-fox-200-011310-1263412938-1263836962.jpg" alt="Avatar" id="vimage_2630012" />If you saw 'Avatar' on Martin Luther King Day, you may have bought the ticket that pushed James Cameron's freshly-crowned Golden Globe winner over the $500 million mark in domestic box office. And you would have helped it become the fastest movie in history to hit that mark, a mere 33 days.

'Avatar's' next big target: the $601 million domestic gross of Cameron's 'Titanic' in 1998. Once thought impossible, 'Avatar's' take-down of its elder sibling is now inevitable.

But there was a minor hiccup on 'Avatar's' way to its newly established records. For one day -- Friday, Jan. 15 -- 'Avatar' was knocked out of the No. 1 spot by 'The Book of Eli,' a poorly-reviewed post-apocalypse thriller that owed its big opening to the popularity of its star Denzel Washington.

'Eli' took in $11.7 million on Friday to 'Avatar's' $10.5 million. But by Saturday, all was right on Earth and Pandora as 'Avatar' retook the lead and, according to Monday estimates, was on its way to a $54.6 million four-day Martin Luther King weekend. Its total is now at about $505 million. 'The Book of Eli' finished its four-day opening at $38 million.

The Golden Globe awards that 'Avatar' won on Sunday night for Best Director and Best Motion Picture, Drama pretty much established the sci-fi epic as the Oscar front-runner as well. The awards certainly give it added momentum as the last audience hold-outs give in and check it out. Also, it now seems likely that most of the 6 or 8 million people who had only seen it in standard projection are taking a second look at it on 3-D and 3-D IMAX screens.

Going wide after several weeks in limited release, Peter Jackson's critically vilified 'The Lovely Bones,' adapted from Alice Sebold's best-seller about a murdered teenager who narrates the story of her death and the plight of her killer, claimed the third spot on the box office chart with a four-day gross of $20.5 million. That's far better than Jackie Chan fared with his latest action film, 'The Spy Next Door,' which barely cleared $13 million over the long weekend.

Of the holiday holdovers, fourth place 'Alvin and the Chipmunks: The Squeakuel' continued to stay ahead of fifth place 'Sherlock Holmes,' selling an estimated $15 million to 'Holmes'' $11.7 million.

Looking ahead, 'Avatar' is likely to sail through to a sixth straight weekend atop the box office. Newcomers 'The Tooth Fairy,' 'Legion' and 'Extraordinary Measures' look like routine releases in a Jan.-Mar. window that is generally considered Inventory Clearance Season for Hollywood.

Four-day weekend estimates:

1. 'Avatar,' $54.6 million (3,285 theaters), $505 million total.
2. 'The Book of Eli,' $38 million (3,111), new release.
3. 'The Lovely Bones, $20.5 million (2,563), $21 million.
4. 'Alvin and the Chipmunks: The Squeakuel,' $15 million (3,296), $196.1 million.
5. 'The Spy Next Door,' $13 million (2,924), new release.
6. 'Sherlock Holmes,' $11.7 million, (3,173), $181.2 million.
7. 'It's Complicated,' $9.6 million (2,673), $90.1 million.
8. 'Leap Year,' $7.1 million (2,512), $19.5 million.
9. 'Up in the Air,' $6.7 million (2,107), $64 million.
10. 'The Blind Side$6.5 million (2,408), $227.7 million.