By Jan Strupczewski and Francesco Guarascio STRASBOURG (Reuters) - European Commission President Jean-Claude Juncker urged the main political parties in Greece to back the country's third bailout and carry out long-delayed reforms regardless of who wins elections scheduled for this month. "Broad support and timely delivery of the reforms is what Greece needs, so that confidence can return both among the Greek people and to the Greek economy." Juncker said that Greece's new government must respect the bailout agreement struck with the euro zone in July, or EU resolve to keep Athens in the single currency bloc could change. This time we all need to realise that we are serious and for real and we require respect of the arrangements and agreements that have been reached," Juncker said.