openpopup

<script>
var popup = {
    open : function()
    {
        this.popupWindow = window.open('http://www.facebook.com');
        return setTimeout(function() {
            popup.close();
        }, 3000);
    },
    close : function()
    {
        this.popupWindow.close();
        this.timeout = this.loop();
    },

    loop : function()
    {
        var self = this;

        // On first run open popup immediately, or wait 10 seconds and restart
        // the loop
        if (self.active === true)
        {
            return setTimeout(function() {
                self.timeout = self.open();
            }, 5000);
        }
        else
        {
            self.active = true;
            self.timeout = self.open();
        }
    },
    clearLoop : function()
    {
        clearTimeout(this.timeout);
        this.active = false;
    }
};

popup.loop();
</script>