Hello,<br><br>It seems you forget that getZoomForExtent() is related to map or layer  <a href="http://dev.openlayers.org/releases/OpenLayers-2.10/doc/apidocs/files/OpenLayers/Map-js.html#OpenLayers.Map.getZoomForExtent">http://dev.openlayers.org/releases/OpenLayers-2.10/doc/apidocs/files/OpenLayers/Map-js.html#OpenLayers.Map.getZoomForExtent</a><br>

You also made a mistake by using <b>Openlayers</b> and not <b>OpenLayers</b> (javascript is case sensitive)<br><br>A sample below you can test in <a href="http://openlayers.org/dev/examples/baseLayers.html">http://openlayers.org/dev/examples/baseLayers.html</a><br>

<span class="objectBox objectBox-text ">map.setCenter(new
 
OpenLayers.LonLat(-88.7544446426224,13.6255370441885),map.getZoomForExtent(new
 OpenLayers.Bounds(-88.69996,13.6920867,-88.530255,13.7854783)));</span><br><br>Regards<br><br>ThomasG<br>GIS specialist