additional browser detection

browser_detection.js

// from http://ryanmorr.com/the-state-of-browser-detection/
if('opera' in window && ({}).toString.call(window.opera) === '[object Opera]'){
    // detect Opera 14-
}
if('operamini' in window && ({}).toString.call(window.operamini) === '[object OperaMini]'){
    // detect Opera Mini
}
if('PalmSystem' in window){
    // detect webOS
}
if('blackberry' in window){
    // detect blackberry
}
if('MozAppearance' in document.documentElement.style){
    // detect Mozilla
}
if('WebkitAppearance' in document.documentElement.style){
    // detect WebKit
}