Plugin Name: AddToAny Share Button for Comments
Plugin Description: Helps readers share, save, bookmark, and email comments using any service, such as Delicious, Digg, Facebook, Twitter, and over 100 more social bookmarking and sharing sites. 
Plugin URL: http://www.addtoany.com/
Author: Pat
Author URL: https://www.intensedebate.com/people/micropat
Date Added: April 17th, 2009

Code:
var id_addtoany_plugin = {};
id_addtoany_plugin.comment_ids = [];
id_addtoany_plugin.addtoany_script_loaded = false;

// Return comment IDs as they appear in DOM (modified getElementsByClass)
id_addtoany_plugin.get_comment_ids = function (className) {
	var testClass = new RegExp("(^|\\s)" + className + "(\\s|$)");
	var elm = document.getElementById('idc-cover'); // Assumed idc-cover
	var elements = elm.getElementsByTagName('div'); // Assumed DIV
	var returnElements = [];
	var current;
	var length = elements.length;
	for(var i=0; i<length; i++){
		current = elements[i];
		if(testClass.test(current.className)){
			returnElements.push(current.id); // Set element ID
		}
	}
	return returnElements; // Return element IDs
}

// Detect external script onLoad
id_addtoany_plugin.load_external_js = function (src, test, callback) {
	var s = document.createElement('script');
	s.src = src;
	document.getElementsByTagName('head')[0].appendChild(s);
	
	var callbackTimer = setInterval(function() {
	var call = false;
	try {
	  call = test.call();
	} catch (e) {}
	
	if (call) {
	  clearInterval(callbackTimer);
	  callback.call();
	}
	}, 100);
};

// Initiate AddToAny drop-down(s)
id_addtoany_plugin.load_addtoany_js = function() {
	a2a_linkname = document.title; // AddToAny global
	var base_location = location.href.split('#')[0] + '#IDComment';
	
	// Additional drop-downs: set location, call a2a_init
	if ( id_addtoany_plugin.addtoany_script_loaded ) {
		var num_ids = id_addtoany_plugin.comment_ids.length;
		for(var i = 1; i < num_ids; i++) {
			a2a_linkurl = base_location + id_addtoany_plugin.comment_ids[i]; // AddToAny global
			a2a_init("page");
		}
	}
	// First drop-down, set location, load AddToAny script (which also calls a2a_init)
	else {
		// Set all comment IDs
		id_addtoany_plugin.comment_ids = id_addtoany_plugin.get_comment_ids('idc-c');
		
		id_addtoany_plugin.addtoany_script_loaded = true;
		a2a_linkurl = base_location + id_addtoany_plugin.comment_ids[0]; // AddToAny global
		id_addtoany_plugin.load_external_js('http://static.addtoany.com/menu/page.js',
			function(){ return (typeof window['a2apage_init'] != 'undefined') },
			function(){ id_addtoany_plugin.load_addtoany_js() }
		);
	}
};


// Insert AddToAny button below each comment
id_addtoany_plugin.insert_share_button = function(args) {
	var comment_text = args['text'],
		comment_id = args['commentid'];
	
	// Add the IntenseDebate commentid to the array of comment IDs
	//id_addtoany_plugin.comment_ids[id_addtoany_plugin.comment_ids.length] = comment_id;

	return comment_text+'<div style="display:block;margin:6px 0 0"><a class="a2a_dd" href="http://www.addtoany.com/share_save"><img src="http://static.addtoany.com/buttons/share_save_171_16.png" width="171" height="16" border="0" alt="Share/Save/Bookmark"/></a></div>';	 
};


// IntenseDebate Filters
id_add_filter('comment_text_load', id_addtoany_plugin.insert_share_button); // Should ideally call our function in the order of comments as they appear in the DOM
id_add_action('idcomments_func_load', id_addtoany_plugin.load_addtoany_js);

CSS:
N/A