Editable Multi-line tooltip on JTable cells

Hi friends,
I have a JTable in a JApplet.
I have a JPopupMenu which gets displayed by right clicking any cell of the Table.
My problems are:
1. How can I restrict the popupmenu to appear by clicking a few of the columns in the table?
2. By selecting the menu item "Add comment" in the popup menu, I want to get an editable area for adding a comment for that cell.
3. By selecting the menu item "Edit comment" in the popup menu, I want to get the earlier comment in an editable area
4. By selecting the menu item "Delete comment" in the popup menu, I want to delete the comment for that cell.
5. By moving the mouse over a cell, the comment related to that cell should be diaplayed as a tool tip.
The comments I like to mimic the comments in the Excel.
If somebody can provide source code, it will be very helpful.
Please help.
Thanks in advance.

tip = getValueAt(rowIndex, colIndex).toString();
tip = "<html>"+tip.replaceAll("\\.","<br>")+"</html>";

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