function swap(items, firstIndex, secondIndex) {  

       var temp = items[firstIndex];  

       items[firstIndex] = items[secondIndex];  

       items[secondIndex] = temp;   

   }  

   function bubbleSort(items) {  

       var len = items.length;  

       if(len <= 0) return false;  

       for(var i = 0; i < len; i++) {  

           for(var j = 0, stop = len - i; j < stop; j++) {  

               if(items[j] > items[j + 1]) {  

                   swap(items, j, j + 1);  

               }  

          }  

       }  

       return items;  

   }