Cuckoo_clock

Why don’t you have “Cuckoo_clock” function?
I have troubles with my time-management. Especially if I’m litening to a playlist, or radio without time-signals.
A cuckoo.clockeasy.com would be a great feature for me.
My suggestion for this feature: a fully customizable javascript bookmarklet.
Suggested parameters:
frequency=[random, hours, deifference, ...]
start=
stop=
url_of_the_cuckoo(which[all, No., time, sound.gravatar])=(url of an mp3 file)
transparency=[%]
volume=[%]

How it would work?
1. whlie I’m surfing the web, I click the bookmarklet. And the bookmarklet puts a cuckoo.clockeasy.com floating box (the box is transparent, and can contain a small (google)ad) upon the page, I’m surfing. And the cuckoo.clockeasy.com plays the preset cuckoo sounds.
2. the javscript code is embeddable (into a blog-layout)
3. A ‘google-docs-form’-like customizing page would be great. Sound.gravatar could be a short (max~3-5 sec) audio file, to identify the user (could be ad, too). With this customizing page, anyone can create a custom Cuckoo_clock.clockeasy (the use of the bookmarklet is not so hard to track).