function median(list){
	function compare(a,b){
		return a-b;
	}
	list.sort(compare);
	var listlength = list.length;
	if (listlength % 2){
		var odd = (listlength / 2 - 0.5);
		alert("Median is:" + list[odd]);
	}else{
		var even = (list[listlength / 2]);
		even += (list[listlength  / 2 + 1]);
		even = (even / 2);
		alert("Median is: " + even);
	}
}

var list1 = [3, 8, 9, 1, 5, 7, 9, 21];
median(list1);