Как создать div вместо alert?

<script type="text/javascript">
function getCookie(name) {
var cookie = " " + document.cookie,
search = " " + name + "=",
setStr = null,
offset = 0,
end = 0;
if (cookie.length > 0) {
offset = cookie.indexOf(search);
if (offset != -1) {
offset += search.length;
end = cookie.indexOf(";", offset)
if (end == -1) {
end = cookie.length;
}
setStr = unescape(cookie.substring(offset, end));
}
}
return(setStr);
}

document.cookie = 'cookie_enable=1';
if (getCookie('cookie_enable') && !getCookie('confirm')){
alert('первая строка \n вторая строка');
document.cookie = 'confirm=1; path=/; max age=31536000';
}
</script>