How to cross-browser detect the presence of Skype installed?

Question

Skype

Actually, you need to know exactly whether it is installed or not,
but as I understand it, the task is unsolvable at the moment, or have I missed something?
It can be in javascript or php.
Help!

Answer 1

You can't be sure to know. Only if the user has installed any Skype plugins for the browser.

Answer 2

if (confirm('У Вас установлен скайп?')) {
    ...
}

:)

Answer 3

if the plugin for Skype is installed, then it adds an icon to xxx-xx-xx on the page, you can search for it using JavaScript

Answer 4

1) enumerate navigator.plugins[] - if there is a mention of Skype - then this is it
2) an attempt to communicate via the skype:// protocol

Answer 5

It is possible, but unfortunately on a flash.
They have this thing: secure.skype.com/i/common/swf/detection_as3.swf

Answer 6

Chrome: -,
FF, IE9, Safari, Opera +