代码：
<HTML>
<HEAD>
<TITLE></TITLE>
<script language="javascript">
function adduser()
{
freelength = document.all.freeid.length;
for (var i=freelength-1;i>=0;i--)
{
if (document.all.freeid.options[i].selected)
{
var newtext = document.all.freeid.options[i].text;
var newvalue = document.all.freeid.options[i].value;
var nowlength = document.all.nowid.length;
document.all.nowid.options[nowlength] = new Option(newtext,newvalue);
document.all.freeid.options[i] = null;
}
}
}
function deluser()
{
nowlength = document.all.nowid.length;
for (var i=nowlength-1;i>=0;i--)
{
if (document.all.nowid.options[i].selected)
{
var newtext = document.all.nowid.options[i].text;
var newvalue = document.all.nowid.options[i].value;
var freelength = document.all.freeid.length;
document.all.freeid.options[freelength] = new Option(newtext,newvalue);
document.all.nowid.options[i] = null;
}
}
}
</script>
</HEAD>
<BODY BGCOLOR="#ffffff" >
<table border="1" cellpadding="3" cellspacing="0" style="border-collapse: collapse" bordercolor="#CCCCCC" width="100%">
<tr>
<td colspan="2">
<table width="90%" border="0" cellspacing="0" cellpadding="0" align="center">
<tr>
<td>
<select name="freeid" multiple size="6" style="width:200px">
<option value="1">admin</option>
</select>
</td>
<td valign="center" align="center">
<input type="button" class="it" value="添加>>" onclick="adduser()"><br><br>
<input type="button" class="it" value="<<删除" onclick="deluser()">
</td>
<td>
<select name="nowid" multiple size="6" style="width:200px">
<option value="11">EHLDCIO</option>
<option value="15">wanglifeng</option>
<option value="16">service</option>
</select>
</td>
</tr>
</table>
</BODY>
</HTML>
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