<script>

 var moo = [1, [1, 2], [3, 4]];


 var sum = 0;
 for (var i = 0; i < moo.length ; i++) {
     if (typeof moo[i] == "object" ) continue;
     sum += moo[i];
 }
 alert(sum);

var sum1 = 0;
for (var i = 0; i < moo.length ; i++) {
    for (var j = 0; j < moo[i].length; j++) {
        sum1 += moo[i][j];
    }
}
alert(sum1);

 alert(sum+sum1);

</script>