Create image buttons in jquery mobile -

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im trying create button in jquery mobile image , no text, far able add data-icon, have feeling done better.

<a onclick="newfunction();" data-icon="plus" data-iconpos="notext" ></a>

you can create button images : 

<img style="height: 40px; width: 40px;" id="newid" data-role="button" src="source\images\greenplus.png" data-iconpos="notext" data-theme="a" />

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