$(document).ready(function() {
   var myBoolean=new Boolean();
   myBoolean = true;

    $('.lt').click(function() {
        if(myBoolean == true){
          $('#dropdown').hide('slow', function() {
                //alert('Animation complete.');
                myBoolean = false;

                $('#openclose').css("background-image", "url(images/arrow-closed.png)");
          });
        }
        else if(myBoolean == false){
           $('#dropdown').show('slow', function() {
                //alert('Animation complete.');
                myBoolean = true;
                $('#openclose').css("background-image", "url(images/arrow-open.png)");
          });
        }
    });

});