[Google Maps API v2] why does not Google Map in User control not working for multiple instances

Hi,
I have created user control which contains google map .
code in user control is as follows
<script type="text/javascript" language="javascript">
var map;
fucntion intialize(){
map = new google.maps.Map(document.getElementById("map_canvas"),
mapOptions);

//set the default center
map.setCenter(myLatlng);
//set the default zoom
map.setZoom(initialZoom);

//Set the map type
map.setMapTypeId(google.maps.MapTypeId.SATELLITE);
}
</script>

HTML code:
<div id="map_canvas" style="float: left; width: 100%; height: 300px;
border: solid 1px black;" > </div>

Call to Initialize() function is from code behind(.ascx.cs) using
Me.Page.ClientScript.RegisterStartupScript(Me.GetType(),
"FunctionCall", "initialize();")

Everythings works fine when single instance for user control is used
in parent page (.aspx page).
But when I tried to used this user control multiple times in
page ,only map for 1st instance is showing. But for other instances it
is not showing anything but blank

I want to display google maps for all instances of the user control
For ex when user control is used 4 times,4 maps should be displayed

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