IP Address

I was wondering if anyone knows of a java applet or a program or anything that i could use to throw on a webpage and have it tell me the ip address of that computer, (not the one that i am on). I would like this so that i dont have to get someone to go to pingmeplease.com or any kind of webswite like that and tell me the ip of my file server is. Instead i would be able to go to my web site and it tell me.