An old entry from a few years back, it had a number of hits so it may be useful, qualified for migration...
I got burned a while back by not having this in place when the submit button in a web-app only appeared under certain circumstances. Place this in the top of a web page to squelch the ENTER key in an INPUT=TEXT in your form. Then they gotta use the button when you say that the time is right =)
<script type="text/javascript">
function stopRKey(keyp) {
var keyp = (keyp) ? keyp : ((event) ? event : null);
var node = (keyp.target) ? keyp.target : ((keyp.srcElement) ? keyp.srcElement : null);
if ((keyp.keyCode == 13) && (node.type=="text")) {return false;}
}
document.onkeypress = stopRKey;
</script>