javascript|项目<script language="javascript">
 function LeftToRight(Left,Right){   //左边加到右边
  for(var i=Left.length-1;i>=0;i--){
   if(Left.options[i].selected){
   var j = Right.options.length - 1;
   for (; j >= 0; j--) {
     if (Left.options(i).value == Right.item(j).value) {
      break;
      }
     }
    if (j<0) {
    var op = document.createElement("OPTION");
    op.text=Left.options[i].text;
    op.value=Left.options[i].value;
   
    Right.add(op);
    //Left.options[i] = null;
    }
   }
  }
 }
function RightToLeft(Right,Left){  //右边加到左边
  for(var i=Right.length-1;i>=0;i--){
   if(Right.options[i].selected){
   var op = document.createElement("OPTION");
   op.text=Right.options[i].text;
   op.value=Right.options[i].value;
   Left.add(op);
   Right.options[i] = null;
   }
  }
 }
 function RightToRemove(Str){  //从右边移除
  for(var i=Str.length-1;i>=0;i--){
   if(Str.options[i].selected){
    Str.options[i] = null;
   }
  }
 }
</script>

<SELECT NAME="left" size="10" multiple="true">
<option value="1">AAA</option>
<option value="2">BBB</option>
<option value="3">CCC</option>
<option value="4">DDD</option>
<option value="5">EEE</option>
</SELECT>
<input type="button" value="--->" ><br/>
<br/>
<input type="button" value="<---" ><Br /><Br />
<input type="button" value="<-->" >

<SELECT NAME="right" size="10" multiple="true" ></SELECT>