Skype link for Phone number:
<a href="callto://+1234567890">Call me at +1234567890a>
Skype link for Skype Username:
<a href="skype:myusername?call">Skype with us at usernamea>
Skype link for Skype chat:
<a href="skype:myusername">Chat with mea>
In the above examples, I have used dummy phone number and Skype user id. I suggest, before using these links to replace dummy numbers and Skype id with your original one.