The international relief effort to help survivors of the Indonesian quake is picking up. But aid workers say it is still a race against the clock, with incoming supplies unable to meet the demand of tens of thousands left homeless.Airborne deliveries of aid and personnel have been focused on the city of Yogyakarta in the south of Java island. The ancient royal capital has re-opened its airport to commercial traffic despite a heavily-damaged terminal. The official death toll continues to rise, though the priority now is shelter and clean water for the living. The international community continues to rally behind the aid effort, with more than 20 countries already responding to Indonesia’s call for help.