How to add html in special chars

Hello there =)

I'm trying to use CKEditor to make a back end interface for users who don't know html, and I want to add some special chars. In fact, I'm trying to allow users to insert glyphicons.

I added in the config.js file those lines:

config.allowedContent = true;
config.extraAllowedContent = 'span(*)';

config.specialChars = ["<span class='icon-large icon-cake'></span>",
	"<link href='bootstrap/css/bootstrap.icon-large.min.css' rel='stylesheet'>"];
// adding the css like this is the only way I found to preview the span in the specialChars box
// maybe there is a better way to do it

config.contentsCss = ['ckeditor/contents.css',
	'bootstrap/css/bootstrap.icon-large.min.css'];

But when I try to insert my special char <span>, only plain text is pasted on the textarea, not the html.

Is there a way to allow it?

Thank you,

Bjorge

PS: forgive my poor english, I'm french =P