generate random number between 2 variables jquery

i need to generate a random number between -100 and a variable 'max_top' ( will always be a positive number, up to roughly 40). The number needs to be able to be a minus as well as positive.

how can i do this?

Answer

You dont need JQuery for this:

var minNumber = -100;

var maxNumber = 40

var randomNumber = randomNumberFromRange(minNumber, maxNumber);

function randomNumberFromRange(min,max)
{
    return Math.floor(Math.random()*(max-min+1)+min);
}

console.log(randomNumber);

jsFiddle DEMO