if (value1 >= 40 and value1 <= 50 and value2 >= 20 and value2 <= 30) {
msg("such and such")
} <function name="IsBetween" parameters="value, min, max" type="boolean"><![CDATA[
return (value >= min and value <= max)
]]></function>if (IsBetween(value1, 40, 50) and IsBetween(value, 20, 30)) {
msg("such and such")
}