Hi Jet,
> Try putting a set widget around the parts that you want refreshed.
>
I believe you may actually need to change the text:
<$set name=dummy value={{$:/temp/update}}>
[img[http://ichart.finance.yahoo.com/t?s=^DJI]]
<$button>Refresh Tiddler
<$action-setfield $tiddler='$:/temp/update' text=<<now>>/>
</$set>
Best wishes,
Tobias.
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