How to show an Default Image in case of Image src attribute is pointing to null

Hi ,
I am displaying Images on to DataGrid by reading an XML File .
This works fine if the Image src is prsent.
Now my question is that sometimes the Image src might be null , then in which case i need to
display some default Image .
<mx:HBox id="hBox">
<mx:Image source="{rep.currentItem.@src}"/>
</mx:HBox>
<images>
<image src="images/One.png" />
<image src="images/Two.png"/>
<image src=""/>
</images>
Please tell me as how to show an Default Image in case of Image src attribute is null .
Please share your ideas on this .
Thanks in advance .

bind the image source to a function
<mx:Image source="{getImage()}"/>
then write a function to detect if an image is present
private function getImage():String
     if ( rep.currentItem.@src == null)
          return "default.png";
     else
          return rep.currentItem.@src;

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