Q1334 How can I extract all the selected options from a multiple selection list?

<form name="myForm">
<select name="mySelect" multiple>
<option value="value data 0">text data 0
<option value="value data 1">text data 1
<option value="value data 2">text data 2
<option value="value data 3">text data 3
<option value="value data 4">text data 4
</select>
<input type="button" value="Show Selected" onClick="selectAll(this.form.mySelect)">
</form>

<script language="JavaScript"><!--
var selects = new Array();

function selectAll(theSel) {
  if (theSel.selectedIndex > -1)
    for (var j=0, i=theSel.selectedIndex; i<theSel.options.length;i++)
      if (theSel.options[i].selected) selects[j++] = theSel.options[i].value;

  var output = '';
  for (var j=0;j<selects.length; j++)
    output += selects[j] + ' \n';

  alert(output);
}
//--></script>