Jquery adding and removing items from listbox

Question

I\'ve created this fiddle, it allows the user to click on either art or video, dynamically populating the the second listbox with the list associated with those selections. Ther

Answer 1

try this if you want to prevent the user from adding an option that already exists

  $("#SelectBox2 option:selected").each(function () {
            if(  $("#SelectedItems option[value='"+$(this).val()+"']").length <=0)
            inHTML += '' + $(this).text() + '';

        })

http://jsfiddle.net/j2ctG/8/

Updated the fiddle for remove also.