Lewis Hamilton is among a number of Formula 1 drivers to show their support for a British Formula 4 driver who had both legs amputated following a crash.
Billy Monger, 17, drove at high speed into the back of a car which seemed to have stopped on the track during Sunday's race at Donnington Park.
"Thoughts and prayers are with you and your family," tweeted Britain's three-time world champion Hamilton.
A fund-raising page for Monger reached over £350,000 by 08:00 BST on Thursday.
Monger, who has been described as "an extremely talented young driver" had to be extracted from his vehicle at the Leicestershire track and airlifted to hospital.
British former World Champion Button posted on Instagram: "This guy needs our help. I will be doing as much as I can to help this dude out."
Williams' Brazilian driver Felipe Massa also showed his support, tweeting: "Let's help him. I'll do my best."
Australian World Endurance Champion Mark Webber wrote "keep boxing mate".
Mercedes, Force India and McLaren have also showed their support on social media.