Path for ratings images lacks leading slash

I think the code that generates the tag for the ratings images needs to put a leading "/" in front. If I had an amazon item being displayed as part of the front page it shows up properly, but if I view it as a node, the image doesn't appear because it's relative to the wrong place (e.g. I'm looking at node/47 and the image src is "sites/all/default/module/amazontools/images/ratings3.gif". Shouldn't it have a "/" in front?