Hi Payal,
Are you using the GE desktop application or the embedded GE API
if it's the latter then:-
<Placemark>
<name>PlaceMarkName</name>
<description><![CDATA[<img src=ulr of image>]]></description>
<Style>
<BalloonStyle>
<displayMode>default</displayMode>
<text><b>$[name]</b><br/>$[description]Description text</
text> // displayed over and under image
</BalloonStyle>
</Style>
<styleUrl>#POI_1</styleUrl>
<LookAt>
<longitude>-13.79967778</longitude>
<latitude>28.85858611</latitude>
<range>6000</range>
<tilt>45</tilt>
<heading>0</heading>
</LookAt>
<Point>
<coordinates> -13.79967778,28.85858611,0.0</coordinates>
</Point>
</Placemark>
Regards
John
www.gtrek.co.uk