function CheckData() {
		var problem = 'No';
		if (document.login.u.value.length <= 0) {
			alert ("Please enter your user name.");
			document.login.u.focus();
			problem = 'Yes';	
		}
		if (document.login.pw.value.length <= 0) {
			alert ("Please enter your password.");
			document.login.pw.focus();
			problem = 'Yes';	
		}
		if (problem == 'No') {
			return true;
		} else { 
			return false; 
		}
	}