Surprised nobody answered this.
1. Make sure the sliced part in question is about the same size as whatever you want to put there. Duh.
2. After generating the html, find that particular cell that the sliced pic is in. Get rid of the <img src=.... tag and instead make the sliced pic the background of the cell.
3. Then you can put whatever html you want in the cell and it will display on top of the sliced pic. Textarea will work fine but sometimes a scrollable table is better, depends. For that just surround the table with div tags containing the overflow:auto style. Add another empty (no style) inner div tag if the horizontal scrollbar isnt needed.