{html_image} generates an HTML tag. The height and width are not printed if not supplied.
href is the href value to link the image to. If link is supplied, an <a href="LINKVALUE"></a> tag is placed around the image tag.
<a href="LINKVALUE"></a>
path_prefix is an optional prefix string you can give the output path. This is useful if you want to supply a different server name for the image.
All parameters that are not in the list above are printed as name/value-pairs inside the created tag.
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