可控制选择框

<script language="JavaScript"> 
<!-- Begin 

function BumpUp(abox) { 
  for(var i = 0; i < abox.options.length; i++) {
    if(abox.options[i].value == "")  { 
      for(var j = i; j < abox.options.length - 1; j++)  { 
        abox.options[j].value = abox.options[j + 1].value; 
        abox.options[j].text = abox.options[j + 1].text; 
      } 
      var ln = i; 
      break;
    } 
  } 
  if(ln < abox.options.length)  { 
    abox.options.length -= 1; 
    BumpUp(abox); 
  } 
} 

/*删除选项移动操作*/
function remove(box) { 
  for(var i=0; i<box.options.length; i++) { 
    if(box.options[i].selected  &&  box.options[i] != "") { 
      box.options[i].value = ""; 
      box.options[i].text = ""; 
    } 
  } 
  BumpUp(box); 
}

/*选择框间单项移动操作*/
function inverse(oldbox,newbox) { 
  for(var i = 0; i < oldbox.options.length; i++) { 
    if(oldbox.options[i].selected  &&  oldbox.options[i] != "") { 
      var no = new Option(); 
      no.value = oldbox.options[i].value; 
      no.text = oldbox.options[i].text; 
      newbox.options[newbox.options.length] = no; 
      oldbox.options[i].value = ""; 
      oldbox.options[i].text = ""; 
    } 
  }
  BumpUp(oldbox); 
} 

/*全移操作*/
function inverseAll(oldbox,newbox) { 
  for(var i = 0; i < oldbox.options.length; i++) {   
      var no = new Option(); 
      no.value = oldbox.options[i].value; 
      no.text = oldbox.options[i].text; 
      newbox.options[newbox.options.length] = no; 
      oldbox.options[i].value = ""; 
      oldbox.options[i].text = "";   
  } 
  oldbox.options.length = 0; 
}

/*下移操作*/
function Movedown(ebox) { 
  for(var i = 0; i < ebox.options.length-1; i++) { 
     if(ebox.options[i].selected && ebox.options[i] != ""){
       var tmpval = ebox.options[i].value; 
       var tmpval2 = ebox.options[i].text; 
       ebox.options[i].value = ebox.options[i+1].value; 
       ebox.options[i].text = ebox.options[i+1].text 
       ebox.options[i+1].value = tmpval; 
       ebox.options[i+1].text = tmpval2; 
     } 
  } 
} 

/*上移操作*/
function Moveup(ebox) { 
  for(var i = ebox.options.length-1; i > 0; i--) { 
     if(ebox.options[i].selected && ebox.options[i] != "") { 
       var tmpval1 = ebox.options[i].value; 
       var tmpval2 = ebox.options[i].text; 
       ebox.options[i].value = ebox.options[i-1].value;
       ebox.options[i].text = ebox.options[i-1].text 
       ebox.options[i-1].value = tmpval1; 
       ebox.options[i-1].text = tmpval2; 
     } 
  } 
} 
//  End --> 
</script> 
<form action="" method="post"> 
<table> 
<tr> 

<td>下拉列表框A： 
<select multiple size=5 name="list1"> 
<option value="one" ondblclick="inverse(this.form.list1,this.form.list2)" >ASP</option> 
<option value="two">PHP</option> 
<option value="three">ASP.NET</option> 
<option value="four">JAVA</option>
<option value="five">DELPHI</option>
</select> 
</td> 

<td> 
<input type="button" value="->" onclick="inverse(this.form.list1,this.form.list2)" name="A1"><br> 
<input type="button" value=">>" onclick="inverseAll(this.form.list1,this.form.list2)" name="A2"><br> 
<input type="button" value="向上" onclick="Moveup(this.form.list1)" name="A3"><br> 
<input type="button" value="向下" onclick="Movedown(this.form.list1)" name="A4"><br> 
<input type="button" value="删除" onclick="remove(this.form.list1)" name="A5">
</td> 

<td> 
<input type="button" value="<-" onclick="inverse(this.form.list2,this.form.list1)" name="B1"><br> 
<input type="button" value="<<" onclick="inverseAll(this.form.list2,this.form.list1)" name="B2"><br> 
<input type="button" value="向上" onclick="Moveup(this.form.list2)" name="B3"><br> 
<input type="button" value="向下" onclick="Movedown(this.form.list2)" name="B4"><br>
<input type="button" value="删除" onclick="remove(this.form.list2)" name="B5">
</td> 
<td>下拉列表框B： 
<select multiple size=5 name="list2"> 
</select> 
</td> 
</tr>

</table> 
</form>