CSS Browser Selector.
A script that allows you to create browser specific CSS to target specific browsers.

Example
You can prefix browser specific elements (available codes: ie, gecko, opera, konqueror, safari) and the library will make sure that the correct items are added in for a particular browser.

This can be considered cleaner than some of the really ugly hacks that you normally face.

.ie .example { 
background-color: yellow
}    

.ie7 .example {
  background-color: orange
}    

.opera .example {
  background-color: gray
}

Available OS Codes

• Available Browser Codes
• win - Microsoft Windows
• linux - Linux (x11 and linux)
• mac - Mac OS

Available Browser Codes

• ie - Internet Explorer (All versions)
• ie6 - Internet Explorer 6.x
• ie5 - Internet Explorer 5.x
• gecko - Mozilla, Firefox, Camino
• opera - Opera (All versions)
• opera8 - Opera 8.x
• opera9 - Opera 9.x
• konqueror - Konqueror
• webkit or safari - Safari, NetNewsWire, OmniWeb, Shiira

For more about the script
http://rafael.adm.br/css_browser_selector

In this case all you have to do is to add small Javascript in your which you can download directly here