Detecting ENTER key into a Textbox

[see07]

Hello:
Using javascript, how can I detect into a Textbox when users press ENTER key and thus to launch a script from a link button?
I’ll appreciate your help in this subject.
A.L.

[see07]

Finally I got an answer:
<script language="javascript">
document.onkeypress = keyhandler;
function keyhandler(e)
{
if(document.TextBox1)
{
Key = e.which;
}
else
{
Key = window.event.keyCode;
if(Key == 13)
{
alert("<INTRO>");
}
}
}