Detection of mobile users

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Javascript

function isMobile() {
	
	var index = navigator.appVersion.indexOf("Mobile");
	return (index > -1);
}
function setStyleMobile() {
	
	document.write("<style>body { font-size: 3em; } </style>");
}
function makeFontTripleSize() {
	document.write("<style>body { font-size: 5em; } </style>");
}


if (isMobile()) {
        setStyleMobile();
	document.write("Mobile browser");
}
else {
        makeFontTripleSize();
	document.write("Regular browser");
}

Hi,

I have the code to differentiate the mobile users and normal desktop users but i don`t want to increase the font size i want to redirect them to two different URL`s Can you have any suggestions. Any help would be appreciated.