[HTML] pobierz, plaintext 
<select name="dokument" multiple="multiple">
<option value="1">1</option>
<option value="2">2</option>
</select>
 
<INPUT class=log onclick="addSelectedToList('post','dokument','doclist')" type=button value="dodaj do listy">
 
<SELECT name=doclist multiple="multiple"></SELECT>
 
<INPUT onclick="delSelectedFromList('post','doclist')" type=button value="Usuń z listy">
[HTML] pobierz, plaintext 

function addSelectedToList( frmName, srcListName, tgtListName ) {
    var form = eval( 'document.' + frmName );
    var srcList = eval( 'form.' + srcListName );
    var tgtList = eval( 'form.' + tgtListName );

    var srcLen = srcList.length;
    var tgtLen = tgtList.length;
    var tgt = "x";

    //build array of target items
    for (var i=tgtLen-1; i > -1; i--) {
  tgt += "," + tgtList.options[i].value + ","
    }

    //Pull selected resources and add them to list
    for (var i=srcLen-1; i > -1; i--) {
  if (srcList.options[i].selected && tgt.indexOf( "," + srcList.options[i].value + "," ) == -1) {
     opt = new Option( srcList.options[i].text, srcList.options[i].value );
     tgtList.options[tgtList.length] = opt;
  }
    }
}

function delSelectedFromList( frmName, srcListName ) {
    var form = eval( 'document.' + frmName );
    var srcList = eval( 'form.' + srcListName );

    var srcLen = srcList.length;

    for (var i=srcLen-1; i > -1; i--) {
  if (srcList.options[i].selected) {
     srcList.options[i] = null;
  }
    }
}

[PHP] pobierz, plaintext 
<?php
$_POST["doclist"]
?>
[PHP] pobierz, plaintext 

document.getElementByName(nazwa_z_doklejonymi+'[]').item(int - kolejne elementy od 0 do length-1)

var tgtList = eval( 'form.' + tgtListName );

var tgtList = document.getElementsByName(tgtListName).item(0)

var srcList = eval( 'form.' + srcListName );

var srcList = document.getElementsByName(srcListName).item(0);