Random number between negative and positive value [duplicate]

Question

Possible Duplicate:
Generating random numbers in Javascript in a specific range?

How can i get a random value between, for example, from -99 to 99, excluding 0?

Answer 1

var num = Math.floor(Math.random()*99) + 1; // this will get a number between 1 and 99; num *= Math.round(Math.random()) ? 1 : -1; // this will add minus sign in 50% of cases 

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Altogether

var ranNum = Math.ceil(Math.random() * 99) * (Math.round(Math.random()) ? 1 : -1)