jQuery namespaced function to determine if a css selector is defined in any attached stylesheet

jquery.styleexists.js

(function ($)
{
	$.styleExists = function (s)
	{
		var exists      = false;
		var stylesheets = document.styleSheets;

		for (var sx = 0, sl = stylesheets.length; sx < sl; sx += 1)
		{
			var sheetclasses = stylesheets[sx].rules || document.styleSheets[sx].cssRules;

			for (var cx = 0, cl = sheetclasses.length; cx < cl; cx += 1)
			{
				if (sheetclasses[cx].selectorText == s)
				{
					exists = true;
					break;
				}
			}
		}

		return exists;
	};
})(jQuery);