function displayMapAndClick ()
    {
        var latlng    = new google.maps.LatLng (29.0167, 77.3833);
        var myOptions = 
        {
            zoom:zm,
            center:latlng,
            mapTypeId:google.maps.MapTypeId.ROADMAP
        };

        map = new google.maps.Map (document.getElementById ("map"), myOptions);
        directionsDisplay.setMap (map); 
    }

Where zm is a global variable set to default 7.

Now, I wish to change the zoom level of this map thorough this program.

What is the way to do that without re-initializing the map, or is re-initializing the map compulsory?

javascript google-maps google-maps-api-3
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