window.onDomReady(function()
{
    var activePerson = null;
    $$("div.person").each(function(person)
    {
        if(!activePerson) 
        { 
            activePerson = person;
            activePerson.addClass("active");
        }
        
        person.onclick = function()
        {
            if(activePerson) {activePerson.removeClass("active"); }
            person.addClass("active");
            activePerson = person;
        };
    });
});