Originally Posted by CreativeLogic If it's in the form use onsubmit within the form tag.

Or, unobtrusively attach the submit handler onload/domready. You're using Prototype so it's easy to do that using Event.observe, also make use of the $ function rather than document.getElementById.

If you use the form's submit event, there's no need to look for which key was pressed, playing with the submit button, etc.