This little snippet reloads all external stylesheets of a document. Perfect as a bookmarklet.

jquery.reloadCss.js

//javascript:
(function($){
	
	function css() {
		$('link[rel=stylesheet]').each(function(){
			var $link=$(this);
			var i=$link.attr('href').indexOf('?');
			$link.clone().attr('href', $link.attr('href').substr(0, i > 0 ? i : undefined) + ('?' + Math.random()).replace('.', '')).load(function(){
				$link.remove();
			}).appendTo('head');
		})	
	}
	
	if (!$) {
		var s=document.createElement("script");
		s.setAttribute("src", "http://code.jquery.com/jquery.js");
		document.getElementsByTagName("body")[0].appendChild(s);
		setTimeout(css, 100);
	} else {
		css();
	}
	
})(jQuery);