You could give an "active" class to the link upon click. Here's an implementation using jQuery
$('a').click(function(){
$('.active').removeClass('active');
$(this).addClass('active');
});
And a native Javascript one:
var elems =document.getElementsByTagName("a");
for (var i = 0; i < elems.length; i++) {
elems[i].addEventListener("click", function (e) {
for (var i = 0; i < elems.length; i++) {
elems[i].className="";
};
this.className = "active";
});
}