Can I use this to make an mp3 fm transmitter?

Can i use an earphone jack instead of a microphone so that I can transmit the signal from an mp3 player (like an iphone) to the radio? If not, can I still use this design but only changing a few thing in order to make it work with a jack instead of a microphone? Here's the page where I found the design http://www.buildcircuit.com/simple-steps-for-making-fm-transmitter/#comment-27599

You could just concentrate on finding a 12.6 or so volt power supply and get one of these for about $10 http://www.mcmelectronics.com/product/60-10013

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