function submitenter(myfield, e) {

	var keycode;
	if (window.event) { keycode = window.event.keyCode; }
	else if (e) { keycode = e.which; }
		else { return true; }
	
	if (keycode == 13) { myfield.form.submit(); return false; }
	else { return true; }
}

function testKeyword(keyword_form, alert_message) {
	var keyword = document.forms.search.keyword.value;
	var trimmed = keyword.replace(/^\s+|\s+$/g, "");
	if(trimmed.length == 0 || keyword == keyword_form){
		alert(alert_message);
		return false;
	}
	
	return true;
}

function submit_form(keyword, alert_message){
	if(testKeyword(keyword, alert_message) == true){
		document.forms.search.submit();
	}
}

function submit_enter(object, event, keyword, alert_message){
	var keycode;
	if (window.event) keycode = window.event.keyCode;
	else if (event) keycode = event.which;
	else return true;

	if (keycode == 13){
		submit_form(keyword, alert_message);
		return false;
	}
	
	return true;
}