网页框里设置跑马灯 ,下拉款隐藏掉后留下空白,前面的背景怎么让他延伸过来

跑马灯代码

setTimeout(function() {

       //隐藏报表块report0的滚动条（此报表块名为report0，根据具体情况修改）

    $("div[widgetname=REPORT0]").find(".frozen-north").css({

        'overflow-x':'hidden',

        'overflow-y':'hidden'

    });

    $("div[widgetname=REPORT0]").find(".frozen-center").css({

        'overflow-x':'hidden',

        'overflow-y':'hidden'

    });

},1000);

window.flag1 = true;

var self1 = this;

//鼠标悬停，滚动停止

setTimeout(function() {

$("div[widgetname=REPORT0]").find(".frozen-center").mouseover(function() {

window.flag1 = false;

});

//鼠标离开，继续滚动

$("div[widgetname=REPORT0]").find(".frozen-center").mouseleave(function() {

window.flag1 = true;

});

var old = -1;

var interval = setInterval(function() {

if (!self1.isVisible()) {

return;

}

if (window.flag1) {

currentpos1 = $("div[widgetname=REPORT0]").find(".frozen-center")[0].scrollTop;

if (currentpos1 == old && 0!=currentpos1) {

$("div[widgetname=REPORT0]").find(".frozen-center")[0].scrollTop = 0;

} else {

old = currentpos1;

//以25ms的速度每次滚动1.5PX

$("div[widgetname=REPORT0]").find(".frozen-center")[0].scrollTop = currentpos1 + 1;

}

}

},

100);

},

1000);