my location when come closer Press I want to get closer

var sbdSetDefault = function(){
var center = new google.maps.LatLng(37.160317, -34.833988); //default address
sbdBase.map.setCenter(center);
sbdBase.map.setZoom(2); // does zoom/////////////////// does zoom/////////////
sbdConfig.defaultDistance = 1000 * 1000;
sbdSetCircle();
}

AVAILABILITY help please