window.onload = function() {
this.embed_videos = function()
{
	// be a stodgy bitch - only work for browsers that can traverse the DOM
	if(!document.getElementById)
	{
		alert('This page uses a script that embeds YouTube and Google video into the page. This script requires a browser that has a modern' +
			  'Javascript implementation. Your browser does not. Please consider upgrading your browser');
		return false;
	}

	// get page links
	var links = this.get_yt_gv_links();

	if(links != null)
	{
		// _this fixes variable scoping - not sure how, but it does
		var _this = this;

		// loop through and manipulate the links
		for(var i = 0; i < links.length; i++) { _this.link_router(links[i]); }
	}
	else
	{
		return false;
	}
}

// get all the links in a page
//
// @return obj - HTML link objects
this.get_yt_gv_links = function()
{
	var page_links = document.getElementsByTagName('a');
	var embed_links = new Array();
	var type;
	for(var i = 0; i < page_links.length; i++)
	{
		// look for:
		//		youtube.com/watch
		//		video.google.com/videoplay
		if( page_links[i].href.match(/youtube.com\/watch|video.google.com\/videoplay/gi) )
		{
			// assign a type to this object
			page_links[i].type = page_links[i].href.match(/google/gi) ? 'google' : 'youtube';

			// add it to the array
			embed_links.push(page_links[i]);
		}
	}

	if(embed_links.length > 0) { return embed_links; }
	else { return null; }

}

// route links to proper processor
//
// @param obj - html link
this.link_router = function(link)
{
	if(link.type == 'google') { this.replace_google_link(link); }
	else { this.replace_youtube_link(link); }
}

// replace individual google link
//
// @param object link
this.replace_google_link = function(link)
{
	// get link
	var googleVars = this.get_key_value_pairs(this.get_query_string(link.href));
	// write to page
	linkChild=document.createElement('div');
	link.parentNode.insertBefore(linkChild, link.nextSibling);
	linkChild.innerHTML = '<embed src="http://video.google.com/googleplayer.swf?docId=' + googleVars['docid'] +
								'" type="application/x-shockwave-flash" id="VideoPlayback" height="326" width="400">';
	link.style.visibility = 'hidden';
	linkChild.style.visibility = 'visible';
}

// replace individual youtube link
//
// @param object link
this.replace_youtube_link = function(link)
{
	// get link
	var strippedLink = link.href.split(/&/gm);
	var processedLink = strippedLink[0].replace(/(\/watch\?)|(=)/gm, "/");

	// write to page
	linkChild=document.createElement('div');
	link.parentNode.insertBefore(linkChild, link.nextSibling);
	linkChild.innerHTML = '<object width="425" height="344"><param name="movie" value="' + processedLink + '&fmt=18"></param><param name="allowFullScreen" value="true"></param><embed src="' + processedLink + '&fmt=18" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344"></embed></object>';
	link.style.visibility = 'hidden';
	linkChild.style.visibility = 'visible';
}

// Get the query string of a url
//
// @param string - url
// @return string - get vars
this.get_query_string = function(uri)
{
	return uri.substr(uri.indexOf('?')+1);
}


// get the key/value pairs of a GET string
//
// @param string - GET string
// @return array - key/value pairs
this.get_key_value_pairs = function(get_string)
{
	// break string into pair strings
	var parts = get_string.split(/&/);

	if(parts.length > 0)
	{
		// array for our key/value pairs
		var get_vars = new Array();
		var temp;
		// get key/value pairs
		for(var i = 0; i < parts.length; i++)
		{
			temp = parts[i].split(/=/);
			get_vars[temp[0]] = temp[1];
		}

		return get_vars;
	}
	else
	{
		return false
	}

}

// run it automatically
this.embed_videos();
}