how to pass parameters to this code?

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C#

ASP.NET

i have this youtube player embedded code in a aspx page,

<object type="application/x-shockwave-flash"  runat="server" id="vidbox"style="width:629px; height:353px;" data="URL">
<param name="movie" value="URL" />
<param value="application/x-shockwave-flash" name="type" /> 
<param value="true" name="allowfullscreen" /> 
<param value="always" name="allowscriptaccess" /> 
<param value="opaque" name="wmode" />
</object>

what i wanna do is, i wanna pass a youtube url to the places where i named URL(the same url goes to those two places). how can i do that?? i'm glad if you could provide me a simple answer right here 'cause the tutorials are much complex to me since i'm a total newbie to this.