Well, as surprising as it gets, the following would work:

<div id="VideoTerm" runat="server" visible=False>
<P></P>
<HR SIZE=1 Class=Ligne>
<FONT class=Titre2>
<asp:Label ID="LabelGenericStepX" runat="server" Text=""></asp:Label> 
<asp:Label ID="LabelTermsConditions" runat="server" Text=""></asp:Label>
</FONT>
<P></P>
<asp:Label ID="LabelVideoTerm" runat="server" Text=""></asp:Label>
<P></P>
<asp:CheckBox ID="IAgree" runat="server" /><asp:Label ID="LabelGenericIAgree" runat="server" Text=""></asp:Label> 
</div>

Even if the interface doesn't have a control for the DIV, it is still posible to add the regular HTML DIV control and manually assign it an ID and the runat syntax. Thus, from the code behind, we can then do:

Dim loControlDIV As System.Web.UI.HtmlControls.HtmlGenericControl = New System.Web.UI.HtmlControls.HtmlGenericControl

' If this is a video
If loRowStore("NoVideo") Then
    loControlDIV = oApp.oPage.FindControl("VideoTerm")
    loControlDIV.Visible = True
End If