function isIE6(){
    if ( document.all && !window.XMLHttpRequest )
        return true;
    else return false;
}

function qqBoxRollforIE6(){
    var A = document.documentElement.scrollTop;
    var B = document.getElementById("dvQQBox");
    B.style.top = (A + 230) + "px";
}

function qqBoxRoll() {
    var A = document.documentElement.clientHeight || document.body.clientHeight;
    var B = document.getElementById("dvQQBox");
    B.style.right = 0;
    if(isIE6()){
        A = document.documentElement.scrollTop;
        B.style.position = "absolute";
        B.style.top = (A + 230) + "px";
    }
    else{
        B.style.position = "fixed";
        B.style.top = (A / 2 - 50) + "px";
    }
}