This version is working on my system:

define img(x)
[img[http://ichart.finance.yahoo.com/t?s=^DJI#?$x$]]
\end

<$macrocall $name=img x=<<now>>/>
<$button>Refresh Tiddler
<$action-setfield $tiddler='$:/temp/update' text=<<now>
>/></$button>

Good luck!
Mark

On Tuesday, October 25, 2016 at 12:55:29 PM UTC-7, FFT wrote:
>
> Regarding the <$set> tag, can you help clarify what I can remove? This is 
> what I have using BJ's suggestion.
>
> \define img(x)
> [img[http://ichart.finance.yahoo.com/t?s=^DJI#?$x$]]
> \end
>
> <$set name=dummy value={{$:/temp/update}}>
> <$macrocall $name=img x=<<now>>/>
>
> <$button>Refresh Tiddler
> <$action-setfield $tiddler='$:/temp/update' text=<<now>>/>
> </$button>
> </$set>
>
>
> On Tuesday, October 25, 2016 at 12:22:28 PM UTC-7, Mark S. wrote:
>>
>> That seems to work on my system. It doesn't seem to need the <$set> tag. 
>> It should probably have the closing button tag for completeness.
>>
>> On Tuesday, October 25, 2016 at 12:02:52 PM UTC-7, BJ wrote:
>>>
>>> the image is probably being cached by the browser try
>>>
>>> \define img(x)
>>> [img[http://ichart.finance.yahoo.com/t?s=^DJI#?$x$]]
>>> \end
>>>
>>> <$set name=dummy value={{$:/temp/update}}>
>>> <$macrocall $name=img x=<<now>>/>
>>> <$button>Refresh Tiddler
>>> <$action-setfield $tiddler='$:/temp/update' text=<<now>
>>> >/>
>>> </$set> 
>>>
>>> On Tuesday, October 25, 2016 at 6:59:49 PM UTC+1, FFT wrote:
>>>>
>>>> I added the </$button> tag, however the tiddler did not rerender the 
>>>> image upon clicking the refresh button; I tried clicking it after 30 
>>>> minutes and it still didn't work.
>>>>
>>>> On Monday, October 24, 2016 at 2:45:26 PM UTC-7, Mark S. wrote:
>>>>>
>>>>> There needs to be a closing *</$button>* tag just before *</$set>* in 
>>>>> Tobias' version.
>>>>>
>>>>> However, I can't tell if it works -- all the stock markets are closed! 
>>>>> The Hong Kong Market won't open for another 4 hours. The London for 
>>>>> another 
>>>>> 11. 16 for the Dow.
>>>>>
>>>>> Good luck!
>>>>> Mark 
>>>>>
>>>>> On Monday, October 24, 2016 at 2:22:49 PM UTC-7, FFT wrote:
>>>>>>
>>>>>> Thanks for suggesting this, however I am not able to get this to 
>>>>>> refresh after clicking the button. Is there something else I can try?
>>>>>>
>>>>>> On Monday, October 24, 2016 at 12:38:26 PM UTC-7, Tobias Beer wrote:
>>>>>>>
>>>>>>> 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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