Minimal Ajax function

ajax.js

// Minimal Ajax function https://gist.github.com/hyeonseok/604812e389aa9e74d346
function ajax(u,c,d){var x=new(this.XMLHttpRequest||ActiveXObject)("Microsoft.XMLHTTP");x.onreadystatechange=function(){this.readyState^4||c(this)};if(d){x.open('POST',u);x.setRequestHeader('Content-type','application/x-www-form-urlencoded')}else{x.open('GET',u)}x.send(d)}
/*
GET request
ajax('whatever.php?foo=bar', function (xhr) {
	console.log(xhr.responseText);
});

POST request
ajax('whatever.php', function (xhr) {
	console.log(xhr.responseText);
}, 'foo=bar');

Inspired by 
- https://code.google.com/p/microajax/
- https://gist.github.com/azproduction/1625623
*/