perhaps the plugin doesn't work with krpano? I don't know:
The megazine page flip you can find here:
http://megazine.mightypirates.de/?c=home&l=en
My xml:
<krpano version="1.0.8">
<include url="global.xml" /> <!--only control-buttons-->
<preview type="sphere" url="%SWFPATH%/preview/innenhofpreview.jpg" details="10" />
<image type="CUBE">
<left url="pano/innenhof_l.jpg" />
<front url="pano/innenhof_f.jpg" />
<right url="pano/innenhof_r.jpg" />
<back url="pano/innenhof_b.jpg" />
<up url="pano/innenhof_u.jpg" />
<down url="pano/innenhof_d.jpg" />
</image>
<plugin name="showgallery" url="files/showgallery.png" origin="left" edge="center" y="280" x="120" visible="true" alpha="1" autoscale="180,180"
onclick="action(showgallery);"
onover=""
onout=""
onhover="showtext(klicken zum Einblenden der Fotogalerie);"/>
<plugin name="hidegallery" url="files/hidegallery.png" origin="left" edge="center" y="280" x="120" visible="false" alpha="1" autoscale="150,150"
onclick="action(hidegallery);"
onhover="showtext(klicken zum Schließen der Fotogalerie);"
/>
<plugin name="gallery" url="" visible="false" alpha="0" zorder="5"/>
<action name="showgallery">
freezeview(true);
set(plugin[showgallery].enable,false);
tween(plugin[showgallery].alpha,0,distance(1,0.15),,set(plugin[showgallery].visible,false));
set(plugin[hidegallery].enable,true);
set(plugin[hidegallery].visible,true);
tween(plugin[hidegallery].alpha,1,distance(1,0.15));
set(plugin[gallery].url,megazine.swf?xmlDataPath=megazine.xml);
set(plugin[gallery].visible,true);
tween(plugin[gallery].alpha,1,distance(1,0.15));
tween(image.alpha,0.5);
</action>
<action name="hidegallery">
tween(plugin[gallery].alpha,0,distance(1,0.15),,action(closegallery));
</action>
<action name="closegallery">
set(plugin[gallery].visible,false);
freezeview(false);
set(plugin[hidegallery].enable,false);
tween(plugin[hidegallery].alpha,0,distance(1,0.15),,set(plugin[hidegallery].visible,false));
set(plugin[showgallery].enable,true);
set(plugin[showgallery].visible,true);
tween(plugin[showgallery].alpha,1,distance(1,0.15));
</action>
</krpano>
<!-- Thanks Mario -->