So I\'m trying to move a \"close\" button to the left side when the user is on Mac and the right side when the user is on PC. Now I\'m doing it by examining the user agent,
Is this what you are looking for? Otherwise, let me know and I will remove this post.
Try this jQuery plugin: http://archive.plugins.jquery.com/project/client-detect
Demo: http://www.stoimen.com/jquery.client.plugin/
This is based on quirksmode BrowserDetect a wrap for jQuery browser/os detection plugin.
For keen readers:
http://www.stoimen.com/blog/2009/07/16/jquery-browser-and-os-detection-plugin/
http://www.quirksmode.org/js/support.html
And more code around the plugin resides here: http://www.stoimen.com/jquery.client.plugin/jquery.client.js