function validateFields() {
	var bValid = true;
	var sTxtLoginValue = document.LoginForm.txtLogin.value;
	var sTxtPasswordValue = document.LoginForm.txtPassword.value;
		//                              
		// Login validation.
		//
	if ( sTxtLoginValue == null || sTxtLoginValue == "" ) {
		bValid = false; 
	}
		//           
		// Password validation.
		//
	if ( sTxtPasswordValue == null || sTxtPasswordValue == "" ) {
		bValid = false; 
	}
		//            
		// If valid, return true; otherwise, display a message
		// and return false.
		//
	if ( bValid ) {
		return true;
	} else { 
		alert("Please enter both a username and password.");
		return false;
	}
}