var speed=20
grade_main_2.innerHTML=grade_main_1.innerHTML
    function Marquee(){
	if(grade_main_2.offsetTop-grade_main.scrollTop<=0)
		grade_main.scrollTop-=grade_main_1.offsetHeight
	else{
		grade_main.scrollTop++
		}
	}
var MyMar=setInterval(Marquee,speed)
grade_main.onmouseover=function() {clearInterval(MyMar)}
grade_main.onmouseout=function() {MyMar=setInterval(Marquee,speed)}

subject_main_2.innerHTML=subject_main_1.innerHTML
    function Marquee2(){
	if(subject_main_2.offsetTop-subject_main.scrollTop<=0)
		subject_main.scrollTop-=subject_main_1.offsetHeight
	else{
		subject_main.scrollTop++
		}
	}
var MyMar2=setInterval(Marquee2,speed)
subject_main.onmouseover=function() {clearInterval(MyMar2)}
subject_main.onmouseout=function() {MyMar2=setInterval(Marquee2,speed)}