title: How to "zoom in" one level with Google maps API V3?
body: <p>I can't find an answer for that simple question anywhere!
  How on earth can we zoom in with one level (+1 from the current one) in google maps API V3?</p>
  <p>I mean is there a function for that purpose? or a hack or whatever?</p>
  <p>What I actually want to do is to zoom by one level onclick on a link located in a marker's infowindow and also the same result <code>ondblclick</code> on the marker but in both cases the zoom should increment only +1 at each event (click on link or <code>dblclick</code> on marker) and the zoom center should be the marker in question.</p>
  <p>I'm open to any suggestion involving native Googlemaps methods, jQuery or plain Javascript.</p>
  <p>Anyone who tickled the same problem?</p>