Sætte 4 felter sammen til IP-adresse og tilføje i select

<script type="text/javascript">

function addIP() {
var ip = form1.range1.value + '.' + form1.range2.value + '.' + form1.range3.value + '.' + form1.range4.value;
var optionName = new Option(ip, ip, true, true);
form1['ip_adresser[]'].options[form1['ip_adresser[]'].length] = optionName;
}

function removeIP() {
    for(var i=form1['ip_adresser[]'].options.length-1;i>-1;i--) {
        if(form1['ip_adresser[]'].options[i].selected) {
        form1['ip_adresser[]'].options[i] = null;
        }
    }
}

function SelectAll(fromObject) {
    for (var i=0, l=fromObject.options.length;i<l;i++) {
        fromObject.options[i].text,fromObject.options[i].selected = true;
    }
}

</script>

<form name="form1" method="post" action="modul_sikkerhed.php">
<table align="center" width="100%" cellspacing="0" cellpadding="0" border="0">
<tr><td class="form_heading" width="170" nowrap><strong>Filtrering:</strong> </td><td nowrap class="form_element"><input type="radio" name="online" value="1"> </td><td class="form_element" nowrap>Tillad alle undtagen&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td class="form_element"><input type="radio" name="online" value="0"> </td><td width="100%" class="form_element">Tillad ingen undtagen</td></tr>
<tr><td height="6"></td></tr>
</table>

<table align="center" width="100%" cellspacing="0" cellpadding="0" border="0">
<tr><td class="form_heading" width="170" nowrap valign="top"><strong>IP-adresser:</strong></td><td class="form_element" width="100%" colspan="6"><select multiple name="ip_adresser[]" size="8" style="width:200px"></select></td></tr>
<tr><td height="6"></td></tr>

<tr><td class="form_heading"></td><td class="form_element"><input name="range1" type="text" maxlength="3" style="width:25px"></td><td class="form_element"><input name="range2" type="text" maxlength="3" style="width:25px"></td><td class="form_element"><input name="range3" type="text" maxlength="3" style="width:25px"></td><td class="form_element"><input name="range4" type="text" maxlength="3" style="width:25px"></td><td class="form_element"><button class="knap" onclick="addIP()">Tilføj</button></td><td class="form_element" width="100%"><button name="fjern" class="knap" onclick="removeIP()">Fjern</button></td></tr>
<tr><td height="6"></td></tr>

<tr><td class="form_heading" width="170" nowrap></td><td class="form_element" colspan="6"><input type="submit" class="knap"  value="Gem indstillinger" onclick="SelectAll(this.form.elements['ip_adresser[]']);"></td></tr>
</table>
</form>