jQuery Stop Watch

jQuery Stop Watch

So i have been using jQuery Stop Watch to for a project that i need the user to be able to see how long they have been on the phone with a client but after they change pages the timer reset back to zero... Is there anyway to prevent this with out using PHP or something else to store a session? I am coding just the front end for this and i am not even sure what the backend will be but most stuff around here is Java which i know nothing about.

here is my script for the timer...

$(document).ready(function() {
$('#timer').stopwatch().bind('tick.stopwatch', function(e, elapsed) {
if (elapsed <= 5000) {
$("timer");
}
else if(elapsed <= 10000) {
$("#timer").css("background", "orange");
}
else {
$("#timer").css("background", "red");
}
}).stopwatch('start') ;
});

Thanks,
Travis