function concat (a, b)
{
	for (i in b)
	{
		a[i] = b[i];
	}
	return a;
}

function isString(s)
{
	return typeof(s) == "string";
}

function isArray(a)
{
	return typeof(a) == "object" && a.length;
}

function isFunction(f)
{
	return typeof(f) == "function";
}

function isObject(o)
{
	return typeof(o) == "object";
}

function myNumber(n)
{
	var t = Number(n);
	if (t + '' == "NaN") return 0;
	return t;
}