HTML output looks like this:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html dir="ltr" xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
<head>
<title>Imageflow for external usage</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" title="Standard" href="imgflow_screen.css" type="text/css" media="screen" />
<script language="JavaScript" type="text/javascript" src="imgflow_imageflow.js"></script>
<style type="text/css">
#imageflow{background-color:#000000;width:895px;}
#imgflowcontainer{margin-top:50px;width:895px;}
#imgflowslider{background-image:url('imgflow_slider.gif');}
#imgflowcaptions{color:#ffffff;}
#imgflowloading{color:#ffffff;}
body{background-color:#000000;}
</style>
</head>
<body>
<div id="imgflowcontainer" style="width:895px;">
<div id="imageflow">
<div id="imgflowloading">
<b>Loading Images</b><br/>
<img src="imgflow_loading.gif" width="208" height="13" alt="loading" />
</div>
<div id="imgflowimages">
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/vogels/b/normal_boomklever-03.jpg" longdesc="displayimage.php?pos=-73" alt="040 Boomklever / Nuthatch" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_rij_veluwe221007_5.jpg" longdesc="displayimage.php?pos=-426" alt="537 Rijp op de Veluwe" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_kneu-05-01.jpg" longdesc="displayimage.php?pos=-529" alt=" 190 Kneu / Linnet" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_zeehond.jpg" longdesc="displayimage.php?pos=-659" alt="599 Zeehond / Seal" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/vogels/l/normal_lepelaar02.jpg" longdesc="displayimage.php?pos=-299" alt="229 Lepelaar / Spoonbill" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_eekhoorn_07_01.jpg" longdesc="displayimage.php?pos=-479" alt="404 Eekhoorn / Red squirrel 02" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_Smiemt_2006_2.jpg" longdesc="displayimage.php?pos=-424" alt="291 Smient / Wigeon" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_Wilde_Chogorie.jpg" longdesc="displayimage.php?pos=-464" alt="469 Wilde Chogorie / 01" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/vogels/K/normal_kneu-03.jpg" longdesc="displayimage.php?pos=-278" alt="189 Kneu / Linnet" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_eekhoorn_07_01crop.jpg" longdesc="displayimage.php?pos=-480" alt="405 Eekhoorn / Red squirrel 01" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/vogels/s/normal_sijs-04.jpg" longdesc="displayimage.php?pos=-332" alt="284 Sijs / Siskin" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_staartmees_06_01.jpg" longdesc="displayimage.php?pos=-477" alt="302 Staartmees / Long-tailed Tit" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_06_kuifaalscholver.jpg" longdesc="displayimage.php?pos=-651" alt="591 Kuifaalscholver / Shag" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_baardman.jpg" longdesc="displayimage.php?pos=-95" alt="006 Baardman / Bearded tit" />
<img class="imgflowimg" src="imgflow_reflect.php?bgc=000000&procent=0.66&cache=0&img=albums/userpics/10001/normal_hert2008-01.jpg" longdesc="displayimage.php?pos=-553" alt="377 Edelhert / Red deer" />
</div><div id="imgflowcaptions"></div><div id="imgflowscrollbar"><div id="imgflowslider"></div></div></div></div><!-- End Imageflow PlugIn -->
</body></html>
Blind guess is that you haven't set up your Coppermine URL properly.