两个Select互换数据

<title>两个Select互换数据，简单实用</title>
<mce:script language="JavaScript1.2"><!--
var MainSel  = null;
var SlaveSel = null;
var Item_org = new Array();function DoAdd(){
var this_sel = null;
for(var i=0;i<MainSel.options.length;i++){
this_sel = MainSel.options[i];
if(this_sel.selected){
SlaveSel.appendChild(this_sel);
i--;
}
}
sort_Main(SlaveSel);
}function DoDel(){
var this_sel = null;
for(var i=0;i<SlaveSel.options.length;i++){
this_sel = SlaveSel.options[i];
if(this_sel.selected){
MainSel.appendChild(this_sel);
i--;
}
}
sort_Main(MainSel);
}function sort_Main(the_Sel){
var this_sel = null;
for(var i=0;i<Item_org.length;i++){
for(var j=0;j<the_Sel.options.length;j++){
this_sel = the_Sel.options[j];
if(this_sel.value==Item_org[i][0] && this_sel.text==Item_org[i][1]){
the_Sel.appendChild(this_sel);
}
}
}
}window.onload=function(){
MainSel  = select1;
SlaveSel = select2;
MainSel.ondblclick=DoAdd;
SlaveSel.ondblclick=DoDel;
var this_sel = null;
for(var i=0;i<MainSel.options.length;i++){
this_sel = MainSel.options[i];
Item_org.push(new Array(this_sel.value,this_sel.text));
}
}
// --></mce:script>
<table width="300" border="0" cellspacing="0" cellpDoAdding="0" align="center">
<tr>
<td width="45%" align="center">
<select id="select1" size="5" multiple style="width: 100px">
<option value="111">111</option>
<option value="222">222</option>
<option value="333">333</option>
<option value="444">444</option>
<option value="555">555</option>
<option value="666">666</option>
</select>
</td>
<td width="10%" align="center">
<input name="DoAdd" type="button" value=">>" onClick="DoAdd()"><br>
<input name="DoDel" type="button" value="<<" onClick="DoDel()">
</td>
<td width="45%" align="center">
<select id="select2" size="5" multiple style="width: 100px">
</select>
</td>
</tr>
</table>