IE 上下滚动展示模仿Marquee机制

var STARTINGOPACITY = 40;    //设置不透明度 
var STARTINP = 70;//设置透明度 
var SCROLLSTUP = 1;//滚动速度，1为一个像素 
var SCROLLSYY = 100;//滚动时间请求 
var reqflg = false; // handles manual scrolling of the content // 
function scrollContent(pardiv,id,sub) { 
var div = document.getElementById("textslider"); 
var divsub = document.getElementById(sub); 
var divpar = document.getElementById(pardiv); 
clearInterval(div.timer); 
div.style.opacity = STARTINGOPACITY * .01; 
div.style.filter = 'alpha(opacity=' + STARTINP + ')'; 
var div2 = document.getElementById("textslider2"); 
if(div2!=null){ 
    clearInterval(div2.timer); 
div2.style.opacity = STARTINGOPACITY * .01; 
div2.style.filter = 'alpha(opacity=' + STARTINP + ')'; 
} 
var tem = div.innerHTML;//第一个页 
tem1 = "<div class=\"slidercontent1\" id=\"textslider2\">"+tem+"</div>";//第二个页 
var objheight = divpar.offsetHeight; 
var divheight = div.offsetHeight; 
//判断是否需要滚屏，如果不需要就不滚动 
if(objheight<divheight){ 
    if(!reqflg){ 
        divpar.innerHTML += tem1; 
        reqflg = true; 
        div = document.getElementById("textslider"); 
        div2 = document.getElementById("textslider2"); 
        //设置高度 
        div2.style.top = divheight-1+ "px"; 
    } 
    div.timer = setTimeout( function() { scrollAnimate(div,div2) }, SCROLLSYY); 
} 
} 
function scrollAnimate(div,div2) { 
//获取两个子div的top值 
var divtop = div.offsetTop; 
//alert(divtop); 
if(divtop==0){ 
    div.style.top = "0px"; 
divtop = 0; 
} 
var div2top = div2.offsetTop; 
if(div2top==0){ 
    div2top = 0; 
div2.style.top = "0px"; 
} 
if(divtop<div2top){ 
    //1号在上面 2号在下面 
div.style.top = divtop - SCROLLSTUP+'px'; 
    div2.style.top = div2top - SCROLLSTUP+'px'; 
    //alert("div.style.top:"+div.style.top+"---div2.style.top:"+div2.style.top+":height:"+div.offsetHeight); 
    //判断是否交换位置,如果高度位置等于top那么交换 
    if(div.offsetTop==-div.offsetHeight){ 
     //将top设置为最下面 
div.style.top = div2.offsetHeight; 
    } 
}else{ 
    //2号在上面 1号在下面 
    div2.style.top = div2top - SCROLLSTUP+'px'; 
    div.style.top = divtop - SCROLLSTUP+'px'; 
    //判断是否交换位置,如果高度位置等于top那么交换 
    if(div2.offsetTop==-div2.offsetHeight){ 
     //将top设置为最下面 
div2.style.top = div.offsetHeight; 
    } 
} 
div.timer = setTimeout( function() { scrollAnimate(div,div2) }, SCROLLSYY); 
} 
// cancel the scrolling on mouseout // 
function cancelScroll(pardiv,id,sub) { 
var div = document.getElementById(id); 
div.style.opacity = 1; 
div.style.filter = 'alpha(opacity=100)'; 
clearTimeout(div.timer); 
var div2 = document.getElementById("textslider2"); 
if(div2!=null){ 
     div2.style.opacity = 1; 
     div2.style.filter = 'alpha(opacity=100)'; 
     clearTimeout(div2.timer); 
} 
}

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