怎样使用jquery实现左右上下移动功能

function selected(thiz) 
{ 
 var name = thiz.name; 
 if(name=="right") 
  $("select[name='left']").val(""); 
 else 
  $("select[name='right']").val(""); 
} 
function Shift(thiz) 
{ 
 var right = $("select[name='right']"); 
 var left = $("select[name='left']"); 
 if(thiz=="left" && right.val() != ""){ 
  lrShift(right,left); 
 }else if(thiz=="right" && left.val() != ""){ 
  lrShift(left,right); 
 } 
 
 //获取选中的值 
} 
//从dest移动到target 
function lrShift(dest,target) 
{ 
 var childrens = dest.children(); 
 var args = ""; 
 //alert(dest.val()); 
 var dests = dest.val() 
 for(var x = 0; x < dests.length; x++) 
 { 
  var vaTemp = dests[x]; 
  target.append("<option value='"+vaTemp+"'>"+vaTemp+"</option>");//追加 
  target.find("option[value='"+vaTemp+"']").attr("selected",true);//给追加获取焦点 
  for(var y = 0; y <childrens.length;y++ )//删除选中的元素 
  { 
   if(childrens.get(y).value==vaTemp) 
    $(childrens.get(y)).remove(); 
  } 
 } 
 dest.val(""); 
} 
function ShiftValue(address) 
{ 
 var right = $("select[name='right']"); 
 var left = $("select[name='left']"); 
 if(right.val()!=null) 
  shift(right,address); 
 else if(left.val()!=null) 
  shift(left,address); 
} 
function shift(obj,address){ 
  //获取选中的值 
  var objData = obj.val(); 
  var childrens = obj.children(); 
  var strs = ""; 
  for(var x = 0; x < objData.length; x++) 
  { 
   strs+="@"+objData[x]; 
  } 
 
  //获取要添加位置对象 
  var temp = null; 
  if(address=="top"){ 
   var number = findSelect(childrens,objData[0]); 
   if((--number) < 0) 
    return; 
   temp = childrens.get(number); 
  } 
  else{ 
   var number = findSelect(childrens,objData[objData.length-1]); 
   if((++number) > childrens.length-1) 
    return; 
   temp = childrens.get(number); 
  } 
 
  //删除选中的值 
  var n = 0; 
  var buffer = new Array(childrens.length-objData.length); 
  for(var x = 0; x < childrens.length;x++) 
  { 
   var value = childrens.get(x).value; 
   if(strs.indexOf(value)==-1) 
    buffer[n++] = value; 
  } 
 
  //添加新排序的值 
  obj.empty(); 
  if(address=="top") 
  { 
   for(var y = 0; y < buffer.length;y++) 
   { 
    if(buffer[y]==temp.value) 
    { 
     for(var x = 0; x < objData.length ; x++) 
     { 
      obj.append("<option>"+objData[x]+"</option>"); 
     } 
    } 
    obj.append("<option>"+buffer[y]+"</option>"); 
   } 
  }else{ 
   for(var y = 0; y < buffer.length;y++) 
   { 
    obj.append("<option>"+buffer[y]+"</option>"); 
    if(buffer[y]==temp.value) 
    { 
     for(var x = 0; x < objData.length; x++) 
     { 
      obj.append("<option>"+objData[x]+"</option>"); 
     } 
    } 
   } 
  } 
  //选中值 
  obj.val(objData); 
} 
function findSelect(selects,objValue) 
{ 
 var number = -1; 
 for(var x = 0; x < selects.length; x++) 
 { 
  if(objValue==selects.get(x).value) 
   number = x; 
 } 
 return number; 
}

<p> 
  <p> 
   <b>未导出字段</b> 
  </p> 
  <p style="float:left;"> 
   <select name="left" multiple="multiple" onchange="selected(this)" style="height:350px;width:200px;"> 
    <option value="姓名">姓名</option> 
    <option value="快件号">快件号</option> 
    <option value="快递公司">快递公司</option> 
    <option value="首重">首重</option> 
    <option value="续重">续重</option> 
   </select> 
  </p> 
 </p> 
 <p style="float:left;"> 
  <p style="margin:30px;margin-top:110px;">
   <input type="button" value="<<" onclick="Shift('left')"/>
  </p> 
  <p style="margin:30px;margin-top:30px;">
   <input type="button" value=">>" onclick="Shift('right')"/>
  </p> 
 </p> 
 <p style="margin-top:-20px;"> 
  <p style="margin-left:22%;"> 
   <b>需导出字段</b> 
  </p> 
  <p style="float:left;"> 
   <select name="right" multiple="multiple" onchange="selected(this)" style="height:350px;width:200px;"> 
    <option value="首价">首价</option> 
    <option value="续价">续价</option> 
    <option value="大大">大大</option> 
    <option value="小小">小小</option> 
   </select> 
  </p> 
 </p> 
 <p style="float:left;"> 
  <p style="margin:30px;margin-top:110px;">
   <input type="button" value="向上" onclick="ShiftValue('top')" />
   </p> 
  <p style="margin:30px;margin-top:30px;">
   <input type="button" value="向下" onclick="ShiftValue('bottom')" />
  </p> 
 </p>