Change the source of Image using StoryBoard

I want to change the source of an image using storyboard in silverlight blend on mouse over:

   <VisualState x:Name="MouseOver">
<Storyboard>
   ---c开发者_如何学Code here--                                           
</Storyboard>
</VisualState>

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Ok finally solved it :

On mouse hover i just turn out the visbility of an image to colapsed and made the visibility of other image to visible. That's it :)

                                <VisualState x:Name="MouseOver">
                                    <Storyboard>
                                        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="fillColor">
                                            <SplineDoubleKeyFrame KeyTime="0" Value=".35"/>
                                        </DoubleAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="image">
                                    <DiscreteObjectKeyFrame KeyTime="0">
                                    <DiscreteObjectKeyFrame.Value>
                                    <Visibility>Collapsed</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                    </DiscreteObjectKeyFrame>
                                    </ObjectAnimationUsingKeyFrames>

                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="hoverimage">
                                    <DiscreteObjectKeyFrame KeyTime="0">
                                    <DiscreteObjectKeyFrame.Value>
                                    <Visibility>Visible</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                    </DiscreteObjectKeyFrame>
                                    </ObjectAnimationUsingKeyFrames>                
                                    </Storyboard>
                                </VisualState>