Electric Guitar through an iMic?

Ok, I bought GarageBand and plugged my guitar in to my iBook, but I am not getting any sound. Any Ideas? I just used an adapter 1/4" to 1/8" to plug in with.
 
So from what I can see, there is no proper place to plug my guitar into my iBook. It only has a hole at the side of the LCD for a mic. I would need to plug into an actual mic input if there was one to make my guitar audible (sp?) right? I was trying to use the speaker port and that is wrong. How do I make this work?
 
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