Dynamically link to CSS with JavaScript

Needed a way to add a CSS file with JavaScript, so I went out a-Googling like I normally do.  Problem is everything I found either worked in Internet Explorer and not in FireFox or the other way around.  Nothing I found worked in both.  So I hacked together a function of my own.  Should have just started with it since it took less time to write than the time I spent searching.

function addCSS(link) {
    var styleEl = document.createElement('link');
    styleEl.type = 'text/css';
    styleEl.href = link;
    styleEl.rel = 'stylesheet';
    document.getElementsByTagName('head')[0].appendChild(styleEl);
}