//scrollBodyId:  String 内部滚动div的id

//scrollBoxId:  String 外面限制div的id

//showHeight:  Int 限制显示高度

//showWidth:  Int 限制显示宽度

//lineHeight:  Int 每行的高度

//stopTime:    Int 间隔停止的时间(毫秒)

//speed:    Int 滚动速度(毫秒，越小越快)

//var sample = new ScrollObj("scroollBody","scroollBox",36,300,19,50,50);

var ScrollObj = function(scrollBodyId,scrollBoxId,showHeight,showWidth,lineHeight,stopTime,speed) {

this.obj = document.getElementById(scrollBodyId);

this.box = document.getElementById(scrollBoxId);

this.style = this.obj.style;

this.defaultHeight = this.obj.offsetHeight;

this.obj.innerHTML += this.obj.innerHTML;

this.obj.style.position = "relative";

this.box.style.height = showHeight;

this.box.style.width = showWidth;

this.box.style.overflow = "hidden";

this.scrollUp = doScrollUp;

this.stopScroll = false;

this.curLineHeight = 0;

this.lineHeight = lineHeight;

this.curStopTime = 0;

this.stopTime = stopTime;

this.speed = speed;

this.style.top = lineHeight;

this.object = scrollBodyId + "Object";

eval(this.object + "=this");

setInterval(this.object+".scrollUp()",speed);

this.obj.οnmοuseοver=new Function(this.object+".stopScroll=true");

this.obj.οnmοuseοut=new Function(this.object+".stopScroll=false");

}

function doScrollUp(){

if( this.stopScroll == true )

return;

this.curLineHeight += 1;

if( this.curLineHeight >= this.lineHeight ){

this.curStopTime += 1;

if( this.curStopTime >= this.stopTime ){

this.curLineHeight = 0;

this.curStopTime = 0;

}

}

else{

this.style.top = parseInt(this.style.top) - 1;

if( -parseInt(this.style.top) >= this.defaultHeight ){

this.style.top = 0;

}

}

}

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