Ok I know I can use the Math.max () to calulate the highest of a given set of numbers but...

What if the numbers were to come from an array? And if the array could be of a variable length? So basically the script would have to calculate the length of the array, then work out the highest number inside it. The first part I can do fine, but calculating the max is where I get stuck!

use the little understood array.sort()

function getMax(p_oArray) {
p_oArray.sort(sortOrder);
return p_oArray[p_oArray.length];
}

function sortOrder(a, b){
return (a - b);
}

var max = getMax(somearray);

(probably needs a "blog" post to explain it )

Ahhhh I never would have thought of that! hehe. Thanks.