Declares employers under such Acts liable for the acts of any individual whose harassment of an employee has created or continued an unlawful hostile work environment if, at the time of the harassment: (1) such individual was authorized by that employer to undertake or recommend tangible employment actions affecting the employee or to direct the employee's daily work activities, or (2) the negligence of the employer led to the creation or continuation of that hostile work environment (thus modifies the liability standards provided by the Supreme Court in Vance v. Ball State University, which limited the category of supervisors for whom an employer may be held vicariously liable to those individuals who have authority to take tangible employment actions).