Leakk!!! D: help
 

Okay so I just noticed a leak on the rear end of my car a few days ago. I'm not sure if it's serious or not, and if it's fixable by myself or if I should bring it into a shop.
HELP pleasee! I really know nothing about cars...but I think it's the transmission maybe? :uhh:
Pics:

http://i45.tinypic.com/2mqj5va.jpg
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http://i49.tinypic.com/2824554.jpg
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http://i50.tinypic.com/2ytpp38.jpg
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http://i47.tinypic.com/2ekhy4i.jpg

could be axle seals!!! ohh nooes! fix seal -- 20 bucks ... new axles ... 600 bucks

:eek: 600?! oh jeez.
guess I'll be taking it into a shop :tear:

Does it smell really bad? or does it smell like gas? whats it smell like?

It smells like rotton eggs I just took a swab of it this morning. Smells awful...doesn't smell like gas or oil. What is this stuff o_O