Egypt will hold new parliamentary elections once amendments to its suspended constitution are approved in a referendum, the interim head of state decreed on Monday, setting out a time frame that could see a legislative vote in about six months.A presidential election would be called once the new legislative chamber convenes, the decree said. It set a four-and-a-half month time frame for amendments to the country's controversial, Islamist-tinged constitution that was passed into law in December.That constitution was suspended last week when the army removed Islamist President Mohamed Morsi from power following mass protests against his rule.