O2.js

function rgbToHex(rgbString) {
 var parts = rgbString.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
 for (var i = 1; i <= 3; i++) {
 parts[i] = parseInt(parts[i]).toString(16);
 if (parts[i].length == 1) parts[i] = '0' + parts[i];
 }
 delete (parts[0]);
 return parts.join('');
}

$(document).ready(function() {
 var darkTheme = $(document.body).is('.dark');
 var bgColor = rgbToHex($('body').css('background-color'));
 
 // Use nice ampersands.
 // http://patrickhaney.com/thinktank/2008/08/19/automatic-awesompersands
 var tags = ['h1','h2','h3','h4','h5','h6','p','blockquote','li'];
 var amp_tags = jQuery.map(tags, function(t) { return t + ":contains('&')"; }).join(',');
 $('.post-body').find(amp_tags).contents().each(function() {
 if (this.nodeType == 3) { // text
 $(this).replaceWith(this.nodeValue.replace(/&/g, '<span class="amp">&amp;</span>'));
 }
 });

 $('.post object').each(function() {
 // Matthew Buchanan's "improved YouTube player"
 // http://matthewbuchanan.name/post/451892574/widescreen-youtube-embeds
 if (!darkTheme) {
 
 if ($(this).find("embed[src^='http://www.youtube.com']").length > 0) {
 // Identify and hide embed(s)
 var parent = $(this).parent();
 parent.css("visibility","hidden");
 var youtubeCode = parent.html();
 var params = "";
 if (youtubeCode.toLowerCase().indexOf("<param") == -1) {
 // IE doesn't return params with html(), soÉ
 $("param", this).each(function () {
 params += $(this).get(0).outerHTML;
 });
 }
 // Set colours in control bar to match page background
 var oldOpts = /rel=0/g;
 var newOpts = "rel=0&amp;color1=0xFFFFFF&amp;color2=0xFFFFFF";
 youtubeCode = youtubeCode.replace(oldOpts, newOpts);
 if (params != "") {
 params = params.replace(oldOpts, newOpts);
 youtubeCode = youtubeCode.replace(/<embed/i, params + "<embed");
 }
 // Extract YouTube ID and calculate ideal height
 var youtubeIDParam = $(this).find("embed").attr("src");
 var youtubeIDPattern = /\/v\/([0-9A-Za-z-_]*)/;
 var youtubeID = youtubeIDParam.match(youtubeIDPattern);
 var youtubeHeight = Math.floor(parent.find("object").width() * 0.75 + 25);
 var youtubeHeightWide = Math.floor(parent.find("object").width() * 0.5625 + 25);
 // Test for widescreen aspect ratio
 $.getJSON("http://gdata.youtube.com/feeds/api/videos/" + youtubeID[1] + "?v=2&alt=json-in-script&callback=?", function (data) {
 oldOpts = /height="?([0-9]*)"?/g;
 if (data.entry.media$group.yt$aspectRatio != null) {
 newOpts = 'height="' + youtubeHeightWide + '"';
 } else {
 newOpts = 'height="' + youtubeHeight + '"';
 }
 youtubeCode = youtubeCode.replace(oldOpts, newOpts);
 if (params != "") {
 params = params.replace(oldOpts, newOpts);
 youtubeCode = youtubeCode.replace(/<embed/i, params + "<embed");
 }
 // Replace YouTube embed with new code
 parent.html(youtubeCode).css("visibility","visible");
 });
 }
 } 
 });
});