Adding an "onenter" event to an input element

Input elements in Javascript do not really have an "onenter" event. You can, however, simulate such an event by hooking the "onkeypress" event:

var l_input = document.getElementById("myelement");

l_input.onkeypress = function(p_event) { if(13 == p_event.keyCode) this.submit(); }

That's it. As simple as that.