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specific alt (title) to the image on three-grid

I am using TreeGrid.setColTypes("tree,img,img,txt");

How to assign the specific alt (title) to the image under img columns instead of default one which is diplaying the image path.

Thanks.

You can do it directly in data XML as 

<cell>some.gif^alt text here</cell>

or , use grid's tooltip functionality as

<cell title="alt text here">some.gif</cell>