hey, I'm right in front of my computer screen.. hehe (bad joke)...
anyway, I was busy with school - that's the reason why I didn't answer 
immediately.
 
I personally think that the exceptional nature of a genius makes him being 
considered as insane by other (or let's say: average) people.
To come to speak of the definition of: "genius" and "insane", I pretty much 
agree with what everyone said. These are relative words, meaning that you 
need a perspective before you can actually define or evaluate them. And 
depending on the perspective you choose, those words can have different 
(even opposing) meanings.
And here's the real dilemma: the choice of perspective. Will it be from the 
point of view of the average or the genius? 
Looking at this problem from an objective ("objective" in my opinion, of 
course - which already implies its subjectiveness;-) point of view comes close 
to how Jim described it: 
(I'm quoting): "I think that the tradoff in being a "thicko" in certain 
areas. While being of exceptional perception in another area is part of being a 
genius."
And to answer Dawn DelliSanti's question (I quote):"Which leads me to ask, 
how this question could EVEN really be asked without providing us with 
definitions to go by?"  
All I can say is: not saying everything precisely leaves more space to 
the debate and it gets even more heated up and interesting.. don't you think? - 
ultimately almost everything is semantics, which leads me to another question: 
Do you think that there actually exist philosophical problems or are they 
just semantical problems rather than real ones (by "real" I mean: authentical 
and autonomical)?
(this question was one debated upon by real philosophers by the way: 
Wittgenstein and Popper who almost jumped to each others' throats because they 
couldn't stand each other and each others' arguments... it's a funny story.. and 
authentic)
 
pozdrawiam, (greetings)
Ewa