Is it possible to use JavaScript to change the meta-tags of the page?

Question

If I put a div in the head and display:none, than use JavaScript to display it, will this work?

Edit:

I have stuff loaded in AJAX. And as my AJAX changes the

Answer 1

If we don't have the meta tag at all, then we can use the following:

var _desc = 'Out description';
var meta = document.createElement('meta');
meta.setAttribute('name', 'description');
meta.setAttribute('content', _desc);
document.getElementsByTagName('head')[0].appendChild(meta);