function noenter() {
 return !(window.event && window.event.keyCode == 13);
 }

function handler(evnt) {
if (window.event) keycd = window.event.keyCode;
else if (evnt && evnt.which) keycd = evnt.which;
else return;
if (keycd==13) {
 return false; 
 }
}
if (document.captureEvents) {
  document.captureEvents(Event.KEYPRESS);
  document.onkeypress = handler;
}
else document.onkeyup=handler;