Hyundai Repair: Oil tank leakage, hyundai accent, oil tank

Question
Hi
I have purchased second hand Hyundai Accent. After few days I found that the oil tank has a leakage (1 inch crack) by which I am loosing 1 lit oil per month.
What sould I do? How much will it cost to change the entire oil tank or can it be repaired by welding from inside?
Urgent reply please!!

Answer
not sure if welding costs more than new one replacement.  either way - old one needs come off.  New one has guarentee.  Weld may be guarenteed but will have to remove and reweld and reinstall as many times as it takes for your welder to get it right.  For best prices i can find on parts I buy parts online at:
http://www.carpartswholesale.com