<script  runat="server">
Sub getCoordinates(sender As Object, e As ImageClickEventArgs)
   mess.Text="×ø±ê£º" & e.x & ", " & e.y
End Sub
</script>

<html>
<body>

<form runat="server">
<p>Çëµã»÷Õâ·ùͼƬ£º</p>
<asp:ImageButton
runat="server"
ImageUrl="/i/eg_buttonnext.gif"
OnClick="getCoordinates"/>
<p><asp:label id="mess" runat="server"/></p>
</form>

</body>
</html>