Try putting a set widget around the parts that you want refreshed.
Something like this:
<$set name=dummy value={{$:/temp/update}}>
[img[http://ichart.finance.yahoo.com/t?s=^DJI]]
<$button>Refresh Tiddler
<$action-setfield $tiddler='$:/temp/update' text=update/>
</$set>
the set widget gets updated when you click the button and everything inside
it should be refreshed. The value and tiddler used don't matter at all,
just that it changes.
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