Tips and tricks

Since jQuery 1.9.0 removed the jQuery.browser functionality, I compiled some useful functions to replicate that functionality.
[raw]

function is_ie(){
    if (navigator.appVersion.indexOf("MSIE") != -1){
    	return true;
    };
    return false;
};
function is_firefox(){
    if (navigator.userAgent.indexOf("Firefox") != -1){
    	return true;
    };
    return false;
};
function is_opera(){
    if (navigator.userAgent.indexOf("Opera") != -1){
    	return true;
    };
    return false;
};
function is_chrome(){
      return navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
};
function is_safari(){
      return navigator.userAgent.toLowerCase().indexOf('safari') > -1;
};
function version_ie(){
      return parseFloat(navigator.appVersion.split("MSIE")[1]);
};
function version_firefox(){
if (/Firefox[/s](d+.d+)/.test(navigator.userAgent)){
var aversion=new Number(RegExp.$1);
return(aversion);
};
};
function version_opera(){
if (/Opera[/s](d+.d+)/.test(navigator.userAgent)){
var aversion=new Number(RegExp.$1);
return(aversion);
};
};
function is_ios() {
    return ((navigator.platform.indexOf("iPhone") != -1) || (navigator.platform.indexOf("iPod") != -1) || (navigator.platform.indexOf("iPad") != -1 || (navigator.platform.indexOf("Android") != -1))
        );
}
function is_android() {
    //return true;
    return (navigator.platform.indexOf("Android") != -1);
}

[/raw]