Js + Css的msn式的popup提示窗口的实现

/*eMsg*/
var divTop,divLeft,divWidth,divHeight,docHeight,docWidth,i = 0;
var eMsg = new Object();
eMsg.lightSrc = '../image/message/light.gif';
eMsg.closeSrc = '../image/message/msgclose.gif';
eMsg.id = 'eMsg';
eMsg.obj = function(){return document.getElementById(eMsg.id);};

eMsg.onLoad = function(){
    try{
        divTop = parseInt(eMsg.obj().style.top,10);
        divLeft = parseInt(eMsg.obj().style.left,10);
        divHeight = parseInt(eMsg.obj().offsetHeight,10);
        divWidth = parseInt(eMsg.obj().offsetWidth,10);
        docWidth = document.body.clientWidth;
        docHeight = document.body.clientHeight;
        eMsg.obj().style.top = parseInt(document.body.scrollTop,10) + docHeight + 10;
        eMsg.obj().style.left = parseInt(document.body.scrollLeft,10) + docWidth - divWidth;
        eMsg.obj().style.visibility="visible";
        eMsg.timer = window.setInterval(eMsg.move,1);
        hp.skin.onBeforChange = function(){
            if(eMsg.obj())eMsg.obj().parentNode.removeChild(eMsg.obj());
        };
    }
    catch(e){}
};
eMsg.onResize = function(){
    i+=1;
    if(i>1000) eMsg.close();
    try{
        divHeight = parseInt(eMsg.obj().offsetHeight,10);
        divWidth = parseInt(eMsg.obj().offsetWidth,10);
        docWidth = document.body.clientWidth;
        docHeight = document.body.clientHeight;
        eMsg.obj().style.top = docHeight - divHeight + parseInt(document.body.scrollTop,10);
        eMsg.obj().style.left = docWidth - divWidth + parseInt(document.body.scrollLeft,10);
    }
    catch(e){}
};
eMsg.move = function(){
    try
    {
        if(parseInt(eMsg.obj().style.top,10) <= (docHeight - divHeight + parseInt(document.body.scrollTop,10)))
        {
            window.clearInterval(eMsg.timer);
            eMsg.timer = window.setInterval(eMsg.onResize,1);
        }
        divTop = parseInt(eMsg.obj().style.top,10);
        eMsg.obj().style.top = divTop - 1;
    }
    catch(e){}
};
eMsg.close = function(){
    eMsg.obj().parentNode.removeChild(eMsg.obj());
    if(eMsg.timer) window.clearInterval(eMsg.timer);
};
eMsg.createInstance = function(titleHtml,bodyHtml){
    if(!titleHtml || !bodyHtml)throw '必须为titleHtml指定值,必须为bodyHtml指定值。';
    var odiv = document.createElement('DIV');
    odiv.id = eMsg.id;
    odiv.innerHTML = '<div class="eMsgInner">'
    + '<div class="head">'
        + '<div class="headLeft"><img src="space.gif" height="1" width="1"/></div>'
        + '<div class="headMiddle">' + titleHtml + '</div>'
        + '<div class="headRight"><img src="' + eMsg.closeSrc  + '" onclick="eMsg.close()" align="absmiddle"/></div>'
    + '</div>'
    + '<div class="body" oncontextmenu="eMsg.close();return false;" title="右键关闭">'
        + '<div class="light"><IMG src="' + eMsg.lightSrc + '"></div>'
        + '<div class="content">'
        + bodyHtml   
        + '</div>'
    + '</div>'
    + '</div>';
    document.body.appendChild(odiv);
};

window.onresize = eMsg.onResize;