How do I read which items have been selected in a multiple listbox

[Claus Mygind]

After the user has made their selection from a multiple select box how can I read the options array to see which items were selected

   
<select
  id  ="PHASECODE"
  name="PHASECODE"
  multiple="multiple"
  size="10"
  onblur="readSelect();"
>
 <option value="10">10. Drilling</option>
 <option value="15">15. Layout</option>
 <option value="30">30. Geotechnical Eng.</option>
 <option value="40">40. Enviromental</option>
 <option value="50">50. Design Services</option>
 <option value="60">60. Construction Material Eng.</option>
 <option value="70">70. Concrete and Asphalt Lab.</option>
 <option value="80">80. Soils Lab.</option>
 <option value="92">92. Maint. Shop Activites</option>
</select>


function readSelect()
{
//how do I determine which items were selected.
}

[Claus Mygind]

Ok I think I got it figured out.

function readSelect()
{
 for (var i = 0; i < document.getElementById("PHASECODE").options.length; i++ )
 {
  if ( document.getElementById("PHASECODE").options[i].selected )
  {
   alert(document.getElementById("PHASECODE").options[i].value);
  }
 }
}