gmap not coming on page????

hi guys m new to Yii trying to implement gmap using Gmap2 extension

i m using Yii1.1.6 ,Gmap2.0 extension

steps are as follows---------

1-extracted extension Gmap2.0 in protected/extension

2-in config main ,in import section------‘ext.Gmap.*’;

3-created new controller & view for gmap

4-written following code—




<script src="http://maps.google.com/maps?file=api&amp;v=2&amp;sensor=true_or_false&amp;          //-------------       Google key-----------//

  key=ABQIAAAAYHXQtSPuNO1uLC4kbOBvBxRAjXr0LoQBOfzx_bw-iZam2U2rpxSke4WPkIbVnzd-mC9m5OmUROjoTQ" 

  type="text/javascript"></script>

<?php

print_r("<pre>");

print_r($gMap);

print("</pre>");

Yii::import('ext.gmaps.*');

$gMap = new EGMap();

$gMap->setCenter(51.245475,6.821373);

$gMap->addMarker(new EGMapMarker(51.245475,6.821373));

$gMap->addMarker(new EGMapMarker(46.262248,6.115969));

//$gMap->setZoom(4);                    //-----------disabled setzoom () other wise giving error   [b]Fatal error[/b]:  Call to undefined method EGMap::setZoom()-----------

$gMap->renderMap();

?>

Output

gray container is coming but map is not visible in that container??????PLZ Help me…

i have the same problem its not working…