IE Zoom Click Coordinates

I have a clickable image on my web site that passes the clicked coordinates
back to the server, where they are processed.

When the user is zoomed at 100%, the coordinates correspond to the image
correctly.

When the user is zoomed at any other zoom level, I get the actual pixel
coordinates that they clicked on, rather than a normalized pair.

To reproduce:

1) Create a 100x100 image in paint. Maybe a crosshair so you can reliably
click in the middle. Save it as 100x100.gif
2) Add the following to an ASPX page:

<asp:ImageButton runat="server" ImageUrl="100x100.gif" ID="Map"
onclick="Map_Click" ></asp:ImageButton>
<br /><br />
<asp:Label ID="lblOutput" runat="server"></asp:Label>


3) Add the following to the codebehind:

protected void Map_Click(object sender, ImageClickEventArgs e)
{
lblOutput.Text = "Clicked at " + e.X + ", " + e.Y;
}


4) Load the page in a web browser. Click the center of the image, and the
label will say "Clicked at 50, 50" (or close to that, anyway)

5) Zoom the image out to 200%. Click the center of the image and the label
will say something like "Clicked at 100, 100"

Expected Behavior : Clicking the center of the image should return X=50 and
y=50 to the server, regardless of the client's chosen zoom level.

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