Bu da işini görebilir belki.
Kod:
<HTML>
<HEAD>
<script Language="JavaScript">
function AddItem(pos){
var ilkCombo = document.getElementById("combo1")
var ikinciCombo = document.getElementById("combo2")
if(pos==1){
if(ikinciCombo.options.length==0){
var ikinciSayi = 0
} else {
var ikinciSayi = ikinciCombo.options.length
}
ikinciCombo.options[ikinciSayi] = new Option(ilkCombo.options[ilkCombo.selectedIndex].text,ilkCombo.options[ilkCombo.selectedIndex].value)
ilkCombo.options[ilkCombo.selectedIndex] = null
}
else if(pos==0){
if(ilkCombo.options.length==0){
var ilkComboSayi = 0
} else {
var ilkComboSayi = ilkCombo.options.length
}
ilkCombo.options[ilkComboSayi] = new Option(ikinciCombo.options[ikinciCombo.selectedIndex].text,ikinciCombo.options[ikinciCombo.selectedIndex].value)
ikinciCombo.options[ikinciCombo.selectedIndex] = null
}
}
</script>
</head>
<BODY>
<form name="frm1">
<SELECT name="combo1" size=2 multiple id="combo1" style="HEIGHT: 134px; WIDTH: 258px">
<option>Test 1</option>
<option>Test 2</option>
</SELECT>
<SELECT name="combo2" size=2 multiple id="combo2" style="HEIGHT: 134px; WIDTH: 258px">
</SELECT>
</form>
<input type="button" onclick="AddItem('0')" value="< Çıkar"> <input type="button" onclick="AddItem('1')" value="Ekle >">
</BODY>
</HTML>