var nav4 = window.Event ? true : false;

if (nav4) {
	document.captureEvents(Event.KEYPRESS);
	document.onkeypress = 
	function (e) {
		if (e.which == 13) {
			document.forms[0].submit();
            return false;
		}
	}
}

function trap_enter(e) {
	if (!nav4) {
	  	if (e.type == "keypress")  var whichCode = e.keyCode
		else var whichCode = e.button;
	 	if (whichCode == 13) {
			document.forms[0].submit();
            return false;
 		}
 	}
}