How to pass jQuery variable with AJAX to PHP page

Trying to pass the variable "flickrurl" to a PHP page with jQuery/ajax. It works when using a plain text string and not the variable. Am I assigning the variable properly? See the full code in action here:

$trash.droppable({
                accept: '#gallery > li',
          开发者_运维问答      activeClass: 'ui-state-highlight',
                drop: function(ev, ui) {
                    deleteImage(ui.draggable);
                                //set variable equal to src of image tag in #gallery > li
                        var  $flickrurl =  $item.find('img').attr("src");
                //pass variable to php page
                      $.post("updateDB.php", $flickrurl );

                }
            });

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jQuery's AJAX functions expect data in JSON form. Try:

$.post("updateDB.php", { 'flickrurl': $flickrurl } );