[Zope] Image <dtml-var tag>

Hi everybody, In my portal I would like people to be able to add images. But as you might understand those people don't want their pictures to get "stolen" . So I tried Zbutton.... I would like to get an image over the image. This wors fine except for the fact that if I call the image like in image_view the dtml-var tag I just sse teh tag as an image ... like http://www.sjeems.com/ilsedelange/sjeems.gif alt=sjeems etc etcetc.> Does anyone have any idea what this <dtml-var tag> does? or does anyone have any other solutions or maby has done it another way? Hope y'all can help me! James