http://www.allny.com/blogs/todo/wp-content/plugins/tweetmeme/button.js

1(function() {
2
3	/**
4	* class Button
5	*/
6	var Button = function(button) {
7		this.construct(button);
8	}
9
10	/**
11	* Methods which belong to the button object
12	*/
13	Button.prototype = {
14		/**
15		* Button.construct(button) < Button
16		* 	- button (Object): DOM reference to a button
17		*/
18		construct: function(button) {
19			var newButton = document.createElement('iframe');
20
21			var url = "http://api.tweetmeme.com/button.js?url=" + escape(button.href);
22
23			// get all the addiontial options
24			url += '&amp;' + button.rel.toLowerCase();
25
26			// tracking data
27			if (document && document.referrer) {
28				var ref = document.referrer;
29				if (ref) {
30					url += '&amp;o=' + escape(ref);
31				}
32			}
33
34			newButton.src = url;
35			newButton.frameBorder = "0";
36			newButton.scrolling = "no";
37
38			// get the style info
39			var params = new Array();
40			var qp = button.rel.split('&');
41			for (var i = 0; i < qp.length; i++) {
42				var kv = qp[i].split('=');
43				if (kv.length > 1) {
44					params[kv[0]] = kv[1];
45				}
46			}
47
48			if (params['style']) {
49				switch(params['style']) {
50			        case 'compact': {
51			            var h = 20;
52			            var w = 90;
53			            break;
54			        }
55			        default: {
56			            var h = 61;
57			            var w = 50;
58			            break;
59			        }
60			    }
61
62				newButton.height = h;
63		    	newButton.width = w;
64			} else {
65				newButton.height = 61;
66		    	newButton.width = 50;
67			}
68
69			button.parentNode.insertBefore(newButton, button);
70			var parent = button.parentNode;
71			parent.removeChild(button);
72
73			this.button = newButton;
74		}
75	}
76
77	/**
78	* class Selector
79	*
80	* Provides a means to select DOM objects from expressions
81	*/
82	var Selector = {
83		/**
84		* Selector.findChildElements -> Array
85		* 	- element (Object): Element to search for children from
86		*   - expression (String): Expression to search for
87		*
88		* <h2>Example</h2>
89		*
90		* The types of selectors supported in the expression are #(id), .(classes) and tag names
91		*
92		* Selector.findChildElements(div, '#hello')
93		* 	-> Objects with id hello which are children of div
94		*/
95		findChildElements: function(element, expression) {
96			// set up the results array
97			var results = new Array();
98
99			if (typeof expression != 'string') {
100				return false;
101			}
102
103			// pull the identifier from the expression (either # or .)
104			var identifier = expression.substring(0, 1);
105			var match = expression.substring(1);
106			// fetch all the child nodes (tested on FF3.6/Opera10.5/Chrome4.1.249.1045
107			this.search(element.childNodes, function(node) {
108				switch(identifier) {
109					case '#':
110						node.id = match ? results.push(node) : false;
111						break;
112					case '.':
113						var classes = node.className;
114						if (classes) {
115							classes = classes.split(' ');
116							for (j in classes) {
117								if (classes[j] == match) {
118									results.push(node);
119								}
120							}
121						}
122						break;
123					default:
124						node.tagName == expression.toUpperCase() ? results.push(node) : false
125						break;
126				}
127			});
128			return results;
129		},
130
131		/**
132		* Selector.search
133		* 	- nodes (Array): Array of DOM elements
134		*   - match (Object): function to run on each node
135		*
136		* <h2>Example</h2>
137		*
138		* Selector.search(children, function(node) {
139		*	node.innerHTML = 'yo';
140		* });
141		*/
142		search: function(nodes, match) {
143			for (var i = 0; i < nodes.length; i++) {
144				if (nodes[i].childNodes.length > 0) {
145					this.search(nodes[i].childNodes, match);
146				}
147				match(nodes[i]);
148			}
149		}
150	}
151
152	// grab all the buttons
153	var buttons = Selector.findChildElements(document.body, '.tm_button');
154
155	// create the button objects
156	var buttonObjs = new Array();
157	if (buttons.length > 0) {
158		for (var i = 0; i < buttons.length; i++) {
159			var obj = new Button(buttons[i]);
160			buttonObjs[obj.url] = obj;
161		}
162	}
163})();