While waiting for an upload, I had a look.

This tag is inserted in the head:

<script src="http://1.2.3.4/bmi-int-js/bmi.js language="javascript">

This is inserted at the end:

<script language="javascript"><!-- bmi_SafeAddOnload(bmi_load,"bmi_orig_img",0);//-->

</script>

The external JS is here: http://pastebin.com/rv3k4meX

Analysis please. At an initial glance it seems to just be about the image compression.