var requiredInputElementIds = new Array();
	var requiredInputElementRegExps = new Array();
	var requiredInputElementMessages = new Array();

	function checkForm() {
		var message = '';
		
		for (var i = 0; i < requiredInputElementIds.length; i++) {
			var value = document.getElementById(requiredInputElementIds[i]).value;
			if (value == '' || 
			    (requiredInputElementRegExps[i] != null && !value.match(requiredInputElementRegExps[i]) ) ) {
				message = message + requiredInputElementMessages[i] + '\n';
			}
		}

		if (message != '') {
			alert(message);
			return false;
		}
		
		return true;
	}