Javascript 腾讯官方网站上的数字浮动新闻效果

<script type="text/javascript">
<!--
    function SwitchDisplay(displayIndex, panelPRefix, imgPrefix, imgPath, imgShowImgFix, imgHideImgFix, minNumber, maxNumber)
{
    for ( var index = minNumber ; index <= maxNumber ; index ++ )
    {
        //var panelID = new String(panelPrefix+index) ;
        //alert(panelID);
        document.getElementById(panelPrefix+index).className = "hidep" ;
        document.getElementById(imgPrefix+index).src = imgPath + index + imgHideImgFix + ".gif" ;
    }
    
    document.getElementById(panelPrefix+displayIndex).className = "showp" ;
        document.getElementById(imgPrefix+displayIndex).src = imgPath + displayIndex + imgShowImgFix + ".gif" ;
}
//-->
</script>