Mine

//javascript

function checkTerm()
{

if (document.form1.area1.value.subString(document.form1.area1.value.lastIndexOf("\n") + 1 == "help")) {

document.form1.area1.value+="XiaOS Help";

}

}

//html

<html>

<body>


<form name="form1" method="post">
<textarea name="area1" onKeyDown="checkTerm();" style="width: 100.4%;" rows="18">
</textarea>

</body>

</html>