He will need to dynamically render different url's.
I have a variable in my report to receive this called: vr_logo_cabecalho, but even putting it in the component image in the Image URL tab this way ->
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{vr_logo_cabecalho}

And in the Java Code i use this:
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report.getVariables().put("vr_logo_cabecalho", "http://fc08.deviantart.net/fs70/f/2010/018/8/c/Antauri_avatar_100x100_by_ChiroChick.png");
Best Regards