title: freeing memory after ajax request
body: <p>after a ajax requst can you then free the memory by doing this?</p>
  
  <pre><code>function Ajax(){
      this.url = null;
      this.data = null;
      this.success = null;
  
      this.global = true;
      this.timeout = JSON_TIMEOUT;
      this.cache = false;
      this.dataType = 'json';
      this.type = 'post';
  
      var _this = this;
  
      this.send = function(){
          var jqxhr = $.ajax({
                  url : this.url,
                  data : this.data,
                  timeout : this.timeout,
                  cache : this.cache,
                  dataType : this.dataType,
                  type : this.type,
                  global : this.global
                  }
              )
              .success(this.success)
              .error(function(){
                  Dialog.set_error({
                      headline : Lang.get('HDL_ERROR'),
                      body : Lang.get('ERR_TIMEOUT'),
                      btns : [
                          {
                              value : Lang.get('BTN_OK'),
                              script : function(){},
                              focus : true
                              }
                          ]
                      })
                  })
              .complete(function(){
                      delete _this;
                  });
      };
  }
  </code></pre>