How to hide the Media type field if no video is uploaded in paglayout

Hi,

I am creating a custom page layout with custom content type through visual studio 2010 for sharepoint 2010.

i need to create a field which supports to upload a video file.

so i created a site column and added it to my content type and added to my page layout.

<Field ID="{7F5AE2F9-C1A2-4BFD-876C-56ECFB7B0210}" Name="Video" DisplayName="Article Video" Type="MediaFieldType"  Group="Article Layout Columns" />

<FieldRef ID="{7F5AE2F9-C1A2-4BFD-876C-56ECFB7B0210}" Name="Video"/>

In my page layout i added the field in both edit and display mode as

   <PublishingWebControls:MediaFieldControl ID="MediaFieldControl1" FieldName="Article Video" runat="server"/>

All is well the video is displayed and i can add video.

My req is i need to show the video div in display mode only if video is added else it should be hidden in display mode.

how to do that?

Aruna