2 Q abort renderen a options collection

[marc]

First one:
Have do I collect multiple choice's from a options group?
*****CODE*****
 <html:select property="product_id" styleClass="prodselect" >
    <html:options collection="products" property="value" 
labelProperty="label" />
  </html:select>
*****CODE END*****

If I have the above. Then have do I collect the choice into an array, 
when I submit??


Second:
I wanna do something fancy with my options box's. I wanna have one 
options box with the choices, then a button. And then a emty options box.
The when I select things in the first options box, and hint the button. 
Then selectet one's magicly move's to the emty box. And then when I 
submit the form I wanna send the choice's from the second one.


Thanks and best regards
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