You don't need to nest concat() as of mapguide 2.4. You only need to seperate by comma. Nesting concat won't work. Also, your SECTIONID, which I'm assuming is an attribute, does not need to be in quotes. The correct string should look like this (not guaranteed to work because I can't check it).
concat('<iframe frameborder=0 scrolling=no marginwidth=0 marginheight=0 height=120 width=150 src=http://www.google.com/gis/chart.asp?Thumbnail=1&Section_ID=', SECTIONID, '></iframe>'))
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