Q1389 How can I detect whether a number is odd or even?

<script language="JavaScript"><!--
function isEven(x) { return (x%2)?false:true; }
function isOdd(x) { return !isEven(x); }

for (var i=0; i < 100; i++)
    document.write(i + ': even - ' + isEven(i) + ', odd - ' + isOdd(i) + '<br>'); 
//--></script>