New Post: Add to List if not in Drop Down

So you dont get the the alert saying  SelectedValueDisplay is not null"?

Browse to your page, then hit F12 to bring up ie developer tools (um.. u r using ie, right?). In developer tools from the menu select Find--> Select element by click, Then go back toe the browser and click on the 'selected items' listbox. Now switch back to developer tools .

Look around the selected tag, a few lines up you should see a select tag with the Title of ''Plans selected values'. Actually, if your alert is not firing, your select box may be  worder slihtly differently , maybe 'Plan selected value' or  'plans selected value' .  Whatever, you need to fine the title of that '??? selected values' control and plug it into the javascript line var selectedValueDisplay = $("select[Title='Plans selected values']")[0];

PS are you using ie? what version?