I'm from Denmark and have a Danish mastercard so wich payment method should i use?
If you have a bank account:
Domestic DKK bank transfers (premium paid over Mt. Gox market price, but you wouldn't be paying any wire fees -- so if buying just a small amount, this might work well for you).
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https://bitcoinnordic.com/bank-transfer/With a bank account and a larger purchase, SEPA transfers through BitSTAMP might be your best method.
With a credit card you can purchase Second Life Lindens (SLLs) through VirWoX. Then you can trade those SLLs for BTCs on their SLL/BTC exchange:
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http://www.VirWoX.comWith a credit card you can add funds (through LiqPay) at Bitcoin-24.
There might be other methods that work for you :
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http://en.bitcoin.it/wiki/Buying_bitcoins