Browser detection with jQuery

navigator.jquery.js

function detectBrowserVersion(){
var userAgent = navigator.userAgent.toLowerCase();
$.browser.chrome = /chrome/.test(navigator.userAgent.toLowerCase());
var version = 0;

// Is this a version of IE?
if($.browser.msie){
userAgent = $.browser.version;
userAgent = userAgent.substring(0,userAgent.indexOf('.'));	
version = userAgent;
}

// Is this a version of Chrome?
if($.browser.chrome){
userAgent = userAgent.substring(userAgent.indexOf('chrome/') +7);
userAgent = userAgent.substring(0,userAgent.indexOf('.'));	
version = userAgent;
// If it is chrome then jQuery thinks it's safari so we have to tell it it isn't
$.browser.safari = false;
}

// Is this a version of Safari?
if($.browser.safari){
userAgent = userAgent.substring(userAgent.indexOf('safari/') +7);	
userAgent = userAgent.substring(0,userAgent.indexOf('.'));
version = userAgent;	
}

// Is this a version of Mozilla?
if($.browser.mozilla){
//Is it Firefox?
if(navigator.userAgent.toLowerCase().indexOf('firefox') != -1){
userAgent = userAgent.substring(userAgent.indexOf('firefox/') +8);
userAgent = userAgent.substring(0,userAgent.indexOf('.'));
version = userAgent;
}
// If not then it must be another Mozilla
else{
}
}

// Is this a version of Opera?
if($.browser.opera){
userAgent = userAgent.substring(userAgent.indexOf('version/') +8);
userAgent = userAgent.substring(0,userAgent.indexOf('.'));
version = userAgent;
}

return version;
}