會產生scrollUp沒有定義的問題

window.onload?=?function?()?{
var?area?=?document.getElementById('moocbox');
var?con1?=?document.getElementById('con1');
var?con2?=?document.getElementById('con2');
con2.innerHTML?=?con1.innerHTML;
function?scrollUp(){
if(area.scrollTop?>=?con1.offsetHeight){
????area.scrollTop=0;
????}else{
????????area.scrollTop++;
????????}
}
var?time?=?50;
var?myScroll?=?setInterval('scrollUp()',time);
area.onmouseover?=?function(){
????clearInterval(myScroll);
????}
area.onmouseout?=?function(){
????myScroll?=?setInterval('scrollUp()',time);
????}
????}