question about resizable

Hi
Few questions.
1. How to force resizable to resize only with one dimension x or y?
2. Is it possible to bound resizing by element that is contained by
resizable. Ex
<div id="main">
<div id="inner" style="{width:30}"></div>
</div>
#main is resizable, and I want to stop resizing when border meets
borders of #innner.
Greetings
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