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    function mergeArray(arr1, arr2) {  
              
            var arr = [];  
            for (var i = 0; i < arr1.length; i++) {  
            arr.push(arr1[i]);  
            }  
                var dup;  
                for (var i = 0; i < arr2.length; i++){  
                dup = false;  
                for (var i = 0; i < arr1.length; i++){  
                if (arr2[i] == arr1[i]){  
                dup = true;  
                break;  
                }  
            }  
                if (!dup){  
                arr.push(arr2[i]);  
                }  
            }  
              
            return arr;  
        }