JavaScript, simple practice

function show_alert(message)
{
alert(message);
}

var hello = "Hello World"
document.write(hello);
document.write("
");

document.write(hello.toUpperCase());
document.write("
");

var x = 5;
var y = 10;
var answer = x+y;
document.write(answer);
document.write("
");
var d = new Date();
document.write(d.getDate());

//show_alert("my alert");
for (var i=0; i<5; ++i){
document.write(i);
}