网页右下角向上浮出一个消息框

<SCRIPT>
    var oPopup = window.createPopup();
    var popTop=50;

    function popmsg(msgstr)...{
        var winstr="<table style="border: 1 solid #FFA6CA" width="241" height="172" border="0" cellpadding="0" cellspacing="0" background="图片路径" >";
        winstr+="<tr><td height="30"> </td></tr><tr><td align="center"><table width="90%" height="110" border="0" cellpadding="0" cellspacing="0">";
        winstr+="<tr><td valign="top" style="font-size:文字大小; color: 文字颜色; face: Tahoma">"+msgstr+"</td></tr></table></td></tr></table>";
        oPopup.document.body.innerHTML = winstr;
        popshow();
    }

    function popshow()...{
        window.status=popTop;
        if(popTop>1720)...{
            clearTimeout(mytime);
            oPopup.hide();
            return;
        }else if(popTop>1520&&popTop<1720)...{
            oPopup.show(screen.width-250,screen.height,241,1720-popTop);
        }else if(popTop>1500&&popTop<1520)...{
            oPopup.show(screen.width-250,screen.height+(popTop-1720),241,172);
        }else if(popTop<180)...{
            oPopup.show(screen.width-250,screen.height,241,popTop);
        }else if(popTop<220)...{
            oPopup.show(screen.width-250,screen.height-popTop,241,172);
        }
        popTop+=10;
        var mytime=setTimeout("popshow();",20);
    }

    popmsg("信息");
</script>