My coding isnt linking properly , its meant to use jquery to detect the OS and change the link accordingly , however it isn't. In my HTML page I have it linked in the header as

<script src="jsquery.js" type="text/javascript"></script>

which loads up my jsquery now

$(document).ready(function() {
if (navigator.appVersion.indexOf("Win") != -1) {
    // Computers runs windows
    $("a[href$='.pdf']").each(function() {
        this.href = this.href.replace("Volumes", "KP01DS0194TG");
    });
}
if (navigator.appVersion.indexOf("Mac") != -1) {
    // computer is a Mac
    $("a[href$='.pdf']").each(function() {
        this.href = this.href.replace("KP01DS0194TG", "Volumes");
    });
}

});

Yet on Mac's it still tries to connect to KP01DS0194TG and not to Volumes - it doesnt change it - how can I get it to recognize the OS and change it accordingly?