whole_func_string: function(){
          var me = this,
              prev = me.store.currentPage - 1;
  
          if (prev > 0) {
              if (me.fireEvent('beforechange', me, prev) !== false) {
                  me.store.previousPage();
              }
          }
      }
func_code_string: function(){
          var me = this,
              prev = me.store.currentPage - 1;
  
          if (prev > 0) {
              if (me.fireEvent('beforechange', me, prev) !== false) {
                  me.store.previousPage();
              }
          }
      }
func_documentation_string: Move to the previous page, has the same effect as clicking the 'previous' button.