How to call this fucntion from text box

I have a text box and I want the function to run only if the user has clicked or tab over to the TxtBox1 and the user presses F9 on their keyboard



document.onkeyup = handleKeyUp;

function handleKeyUp(e)
{
if(!e)
var e = window.event;

key = e.keyCode;
Frm.txtBox1.value = key;

if (key == 120)
{
alert("You pressed F9 key");
}

}

Here's some code a friend of mine wrote not long ago:

Code:

---

<SCRIPT LANGUAGE="JavaScript">
function CheckForEnter()
{
  if(event.keyCode == 13)
      document.getElementById("Send").click();
}
</SCRIPT>

<textarea cols=50 rows=4 name=message id=message onKeyPress="CheckForEnter();"></textarea><br>
<input type=button value=Send! ID="Send" NAME="Send" onClick='erase_data()'>

---

You should be able to edit that easily enough to suit your needs.