ASP.NET Routing - rendered path to ~/mypath differs on IIS and WebDev server

Question

Hi, I have a route in my website for ExportTo :

Shared Sub RegisterRoutes(routes As System.Web.Routing.RouteCollection)
Dim urlPattern As String
Dim categoryRoute As System.Web.Routing.Route

    urlPattern = "ExportTo.aspx/{fileName}"
categoryRoute = New System.Web.Routing.Route(urlPattern, New ExportRouteHandler("~/ExportTo.aspx"))

routes.Add("ExportToRoute", categoryRoute)End Sub

In my ExportTo.aspx, I have this :

<asp:Image ID="Image1" runat="server" ImageUrl="~/images/logo.JPG" />

This renders like this on my Dev machine (WebDev.WebServer)

<img id="Image1" src="../images/logo.JPG" style="border-width:0px;" /></a>

And like this on IIS 6

<img id="Image1" src="images/logo.JPG" style="border-width:0px;" /></a>

So when I go to a page like http://intranet/exportTo.aspx/filename.pdf, the image is rendered correctly on WebDev, but not on IIS.

Any clues?