I have two multiple select boxes. I need to use JQuery to drag selected items from one combobox to the next. Is this at all possible?

I need to drag items from this box

     <select id="select1"  multiple=multiple> 
<option  value="1">test1</option> 
<option  value="2">test2</option> 
<option  value="3">test3</option> </select>

to this box

<select id="select2" multiple=multiple>
<option value="4">test4</option>
</select>

Any pointers help will be appreciated