Dynamically add css to document

addCssToDocument.js

function addCssToDocument(css) {
    var styleElement = document.createElement('style');
    document.getElementsByTagName('head')[0].appendChild(styleElement);
    var isIe = styleElement.styleSheet;
    
    if (isIe)
        styleElement.styleSheet.cssText = css;
    else
        styleElement.appendChild(document.createTextNode(css));
}