 Webber was granted an early release from his Jaguar contract to be allowed to test with his new team , Williams , over the winter . Williams had announced that Jenson Button would drive for the team in 2005 alongside Webber but , after claims that Button was still contracted to BAR , his contract with Williams was overturned . With his new team @-@ mate undecided and going down to a " shootout " between Nick Heidfeld and Pizzonia , Webber hit back at Pizzonia 's claims of unfair treatment during 2003 , claiming the Brazilian was lying and saying he was a " loser " for believing that there was favouritism towards Webber , comments which led to a reprimand from his new team . 
