Javascript: dynamically adding CSS in to document

gistfile1.js

function loadCSS(css) {
    var styleElement = document.createElement("style");

    styleElement.type = "text/css";

    if (styleElement.styleSheet) {
        styleElement.styleSheet.cssText = css;
    } else {
        styleElement.appendChild(document.createTextNode(css));
    }

    document.getElementsByTagName("head")[0].appendChild(styleElement);
}