Real Madrid president Ramon Calderon has resigned after an emergency board meeting over a vote-rigging scandal.Marca newspaper previously published allegations of irregularities at the club's general assembly last month."Against the recommendations of my board I've decided to step down," said Calderon. "I have committed errors but not irregularities."In charge since 2006, Real have twice won the Spanish league during the 57-year-old lawyer's tenure as president.Despite Real's two title wins under Calderon, he fired the two coaches responsible for that success, first sacking Fabio Capello and more recently Bernd Schuster.Calderon will be replaced by Vicente Boluda, who takes charge until a new presidential election can be held in the close season.And Calderon has also faced criticism over Real's courting of Manchester United forward Cristiano Ronaldo.Source: BBC