how to transfer element between two list boxes ?

[A. Lotfi]

Hi,
   
  I am using struts1.2.9
   
  I have a jsp file that has two list boxes :
   
  <html:form action="transfertoDB">
            <html:select property="menu" size="10" >
                <html:option value="">--SELECT--</html:option>
                <html:options collection="menuList1" property="value" 
labelProperty="label" />
            </html:select>  
           
            <html:select property="menu" size="10" >
                <html:option value="">--SELECT--</html:option>
                <html:options collection="menuList2" property="value" 
labelProperty="label" />
            </html:select>  
        </html:form>
   
  I have two questions :
  1) I hard coded the size of the lists to 10,How to make the size dynamic?
   
  2) I would like to transfer element between the two lists .
   
  Thank you , your help is appreciated.

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