jQuery show/hide a div based on select value

Question

I have a select list with values \'all\' and \'custom\'. On select with value \'custom\' a div with class \'resources\' should appear, and if the value is \'all\' it should

Answer 1

  $("#privileges").change(function(){
     var select=  $(this).val();
       if(select=='custom'){
          //some code
         }
    }); 

or

  var select=$('#privileges :selected').val()
    if(select=='custom'){
    //some code
  }