HelpI need help. GUI help.

I need someone's help with making/coding/compiling a mod. I feel no need to learn Java being only 15 and I know the community on here is great at helping noobs out.

What I need is a mod that adds the GUI in the Multiplayer Menu. I have several alts that I would like to use but I don't want to use a hacked client because I don't necessarily like hacking. But if someone could either find or make a mod that adds to the GUI in Minecraft so that I could login to another account with out exiting Minecraft and reopening it, and also not use a hacked client that'd be great. I have searched the web on how to do this for a good 2 hours now and so far found nothing that helped me. So if one of you guys could help me out that'd be great!

Thanks
Rokinscom

Coding a client for that purpose only is a bit pointless. Perhaps use a client and just disable it as you log in? I see no problem having it installed as long as you don't use it!