hi, Its my first time to try skype on slackware. I have slackware version 10.1 having kernel 2.4.29.I downloaded skype-1.2.0.18.tar.bz2 at www.skype.com. I installed it through
tar -xjvf skype-1.2.0.18.tar.bz2 then it creates a directory called "skype-1.2.0.18/" on it, but i rename it to "skype/" directory. When I try to execute skype by ./skype &
it shows up an error which skype can't load its application. the error is:

Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified


Can somebody help me on how to resolve it?

Are you starting the skype executable as root?
If so, try as a user.
If you really insist on running it as root, and you know what you are doing, login as root, and then type:
xhost + localhost

"county" is quite right; this is a generic X permissions issue, not a Skype issue.

Indeed, it suggests the user executing the application is not the owner of the X server, and this often means an attempt to run as the root user, but it could be other things.

Find a simple X app like xlogo or xeyes or xterm, and get that working from the prompt where you'll be starting Skype. Then you can move on to Skype-specific issues, if any.