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Use this to register a call back to catch the loading of an image <dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>fun</em>&nbsp;</td><td>Instrumentation function for images, it is passed an image and v </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>v</em>&nbsp;</td><td>the value of to pass to fun when