google map dynamic array waypoints

Question

Hi; I want to create wyptns array. But it will be dynamic array. It excepts max 20 elements.I think that,I must combine four array for 70 elements. But how??

Then embedded this code.. var request = { origin: start, destination: end, waypoints: waypts, optimizeWaypoints: true, travelMode: google.maps.DirectionsTravelMode.DRIVING };