[jQuery] Best way to do tree-navigator + content-pane layout?

[Sophie]

I am trying to something like this, with a tree navigator in the left
and a content pane on its right. What is the best way to make the
right edge of the tree navigator movable (i.e. T is resizable, but C
resizes simultaneously)?

----------------------------
|         |                 |
|         |                 |
|   T    |      C         |
|         |                 |
----------------------------

Thanks.