Edit in JSFiddle

JavaScript
HTML
CSS
Result

<body>

<p>Result http://alph4delta.blogdetik.com/wp-content/themes/letoprime-091/style.css.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    var x = document.createElement("LINK");
    x.setAttribute("rel", "stylesheet");
    x.setAttribute("type", "text/css");
    x.setAttribute("media", "screen");
x.setAttribute("href", "http://alph4delta.blogdetik.com/wp-content/themes/letoprime-091/style.css");
    document.head.appendChild(x);
}
</script>