public boolean isOverLap(Schedule sc) {
		boolean retval = false;
		if(startDay==sc.startDay || startDay==sc.endDay){
	    	retval = true;
		}else if(endDay==sc.startDay || endDay==sc.endDay){
			retval = true;
		}else if (startDay >= sc.startDay && startDay <= sc.endDay) {
			retval = true;
		} else if (endDay>=sc.startDay && endDay <= sc.endDay) {
		retval = true;
		}
		return retval;
	}