var positionOnTimeline = function(the_interval, timerelative, dt) { if(dt !== undefined) { timerelative = positionRelative(interval, dt); } return { begin: (timerelative.start - interval.base) * (config.nav.interval_width / config.nav.multiplier.current), end: (timerelative.end - interval.base) * (config.nav.interval_width / config.nav.multiplier.current) }; }