决策报表中滚屏效果，实现了滚动，但是滚动条隐藏不了，请问js语句哪里有啥问题啊

setTimeout(function() {

$("div[widgetname=report41]").find("#frozen-center").css('overflow-x', 'hidden'); 

$("div[widgetname=report41]").find("#frozen-center").css('overflow-y', 'hidden');

$("div[widgetname=report41]").find("#frozen-north").css('overflow-x', 'hidden');

$("div[widgetname=report41]").find("#frozen-north").css('overflow-y', 'hidden');

$("div[widgetname=report41]").find(".reportContent").css('overflow-y', 'hidden');

$("div[widgetname=report41]").find(".reportContent").css('overflow-x', 'hidden');

}, 500);

window.flag = true;

setTimeout(function() {

$("#frozen-center").mouseover(function() {

window.flag = false;

})

//鼠标悬停，滚动停止 

$("#frozen-center").mouseleave(function() {

window.flag = true;

})

//鼠标离开，继续滚动 

var old = -1;

var interval = setInterval(function() {

if (window.flag) {

currentpos = $("#frozen-center")[0].scrollTop;

if (currentpos == old) {

$("#frozen-center")[0].scrollTop = 0;

} else {

old = currentpos;

$("#frozen-center")[0].scrollTop = currentpos + 1.5;

}

}

}, 100);

//以25ms的速度每次滚动3.5PX 

}, 1000)