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This code will might help you:

 

 

HTML Code :

<select class='sel' id='left' multiple>
<option value='1'>one</option>
<option value='2'>two</option>
<option value='3'>three</option>
<option value='4'>four</option>
<option value='5'>five</option>
<option value='6'>six</option>
</select>
 
<input type='button' value='>>' onclick='move(0)'>
<input type='button' value='<<' onclick='move(1)'>
 
<select class='sel' id='right' multiple>
</select>

Javascript Code :

<script type="text/javascript">
function move(direction)
{
	var src = document.getElementById('left' )
	var trg = document.getElementById('right' )	
	var tem
 
	if(direction)
	{
		tem = src
		src = trg
		trg = tem
	}
 
	var selected = []
 
	for(var i in src.options)
	{
		if(src.options[i].selected)
		{
			trg.options.add(new Option(src.options[i].text, src.options[i].value));
			selected.unshift(i);
		}
	}
 
	for(i in selected)
		src.options.remove(selected[i]);
}
</script>
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