@Beeswax
Strange. For me, the preview works in RapidWeaver.
Nice that it works for you now, on the net 
Look here, on my test homepage. Above using Drag & Drop, bottom via resources, with this code.
<img src="%resource(rocker_ani.gif)%" class="myImgClass "/>
Apologies, my English is not good enough to understand everything right. I am Swiss German.