Want to see what molten lava looks like underwater, as it advances toward you on the ocean floor? WNET gives top priority to video on its new website, including an enhanced web experience for Nature fans. Preview the lava scene, shot for a future show on Hawaii's Kilauea volcano. Paul Atkins swam into 100-degree water to film it in HD, writes Fred Kaufman, e.p. WNET is keeping the new sites easy to update for program staffers by organizing them in a multi-user version of WordPress, an open-source content management system widely used by bloggers, instead of a more complex CMS, says Thirteen.org chief Dan Goldman.