Detect the type of user agent (IE?FF?)

PHP:
http://www.diybl.com/course/4_webprogram/php/phpjs/2008515/116115.html
ASP:
http://www.zychina.com.cn/article/160/184/4511.html
JAVASCRIPT:
http://www.cnblogs.com/leadzen/archive/2008/09/06/1285764.html
WIKI:
http://en.wikipedia.org/wiki/User_agent
Others:
http://blog.csdn.net/perddy/archive/2008/04/11/2282287.aspx

ffx addon:
https://addons.mozilla.org/en-US/firefox/addon/967

Install IE on Ubuntu

http://www.howtoforge.com/how-to-install-internet-explorer-on-ubuntu8.04
http://yourubuntulinux.blogspot.com/2007/12/how-to-install-ie4linux-on-ubuntu-710.html
http://www.linuxine.com/2008/02/guide-for-installing-ie4linux-on-ubuntu.html
http://www.ubuntugeek.com/running-internet-explorer-in-ubuntu-linux.html