SessionKeepAlive =
{
    delay: 10000,
    url: undefined,
    run: function() {       
        if (this.url) {
            $.get(this.url + "?d=" + escape(new Date().getTime()));
            setTimeout("SessionKeepAlive.run()", this.delay);
        }
    },
    start: function(delay, url) {
        // Set ajax timeout to 2 seconds
        $.ajaxSetup({ timeout: 2000 });

        // Convert delay to millis
        this.delay = parseInt(delay) * 60000;
        this.url = url;
        setTimeout("SessionKeepAlive.run()", this.delay);
    }
};