รบกวนถามหน่อยครับ ย้าย move ข้อมูลจาก textbox ไปยังอีก textbox ครับ

<script language="JavaScript">        
function MoveOption(objSourceElement, objTargetElement)    {        
	var aryTempSourceOptions = new Array();        
	var x = 0;                       
	for (var i = 0; i < objSourceElement.length; i++) {            
		if (objSourceElement.options[i].selected) {                               
			var intTargetLen = objTargetElement.length++;                
			objTargetElement.options[intTargetLen].text = objSourceElement.options[i].text;                
			objTargetElement.options[intTargetLen].value = objSourceElement.options[i].value;            
		}            
		else {                              
			var objTempValues = new Object();
			objTempValues.text = objSourceElement.options[i].text;                
			objTempValues.value = objSourceElement.options[i].value;                
			aryTempSourceOptions[x] = objTempValues;                
			x++;           
		 }        
	}                      
	objSourceElement.length = aryTempSourceOptions.length;               
	for (var i = 0; i < aryTempSourceOptions.length; i++) {            
			objSourceElement.options[i].text = aryTempSourceOptions[i].text;            
			objSourceElement.options[i].value = aryTempSourceOptions[i].value;            
			objSourceElement.options[i].selected = false;        
	}    
}    

function checkAllItems()
{
	for (var i = 0; i < frmMain.ddlLeft.length; i++) {   
		frmMain.ddlLeft.options[i].selected = true;    
	}    
	
	for (var i = 0; i < frmMain.ddlRight.length; i++) {   
		frmMain.ddlRight.options[i].selected = true;    
	} 	 
}

function removeAllItems()
{
	for (var i = 0; i < frmMain.ddlLeft.length; i++) {   
		frmMain.ddlLeft.options[i].selected = false;    
	}    
	
	for (var i = 0; i < frmMain.ddlRight.length; i++) {   
		frmMain.ddlRight.options[i].selected = false;    
	} 	 
}
</script>