Get a list of all attributes for a given selector

attributes.js

(function($, selector)
	{
		var coll = {};
		$(selector).map(function(ei, ev) {
			if(typeof ev.attributes != "undefined") {
				$.map(ev.attributes, function(av, ai) {
					if(!coll[av.name]) coll[av.name] = true;
				});
			}
		});
		return $.map(coll, function (value, key) { return key; });
	}
)(window.jQuery, "a")