超链接提示特效渐隐

<script type = "text/javascript" language = "JavaScript">
//IE专用
var sPop = null;
document.write("<style type='text/css'>");
document.write(".PopText { font-family: Tahoma, 宋体; color: #000000; background-color: #ffffff; border: 1px #000000 dashed; font-size: 11px; line-height: 14px; padding: 4px; visibility: hidden; filter: Alpha(Opacity=0)}");
document.write("</style>");
document.write("<div id='popLayer' style='position:absolute;z-index:1000;filter:revealtrans(duration=.5,transition=12) revealTrans(duration=1,transition=23) alpha(opacity=90,enabled=100)' class='PopText'></div>");

function showPopupText() {
    var o = event.srcElement;
    MouseX = event.x;
    MouseY = event.y;
    if (o.alt != null && o.alt != "") {
        o.pop = o.alt;
        o.alt = ""
    }
    if (o.title != null && o.title != "") {
        o.pop = o.title;
        o.title = ""
    }
    if (o.pop) {
        o.pop = o.pop.replace("/n", "<br>");
        o.pop = o.pop.replace("/n", "<br>");
    }
    if (o.pop != sPop) {
        sPop = o.pop;
        if (sPop == null || sPop == "") {
            popLayer.filters[0].apply();
            popLayer.style.visibility = "hidden";
            popLayer.filters[0].play();
            popLayer.style.width = ""
        } else {
            if (o.dyclass != null) popStyle = o.dyclass
            else popStyle = "PopText";
            popLayer.filters[1].apply();
            popLayer.style.visibility = "visible";
            popLayer.filters[1].play();
            showIt();
            if (popLayer.offsetWidth> 500) {
                popLayer.style.width = 500
            }
        }
    }
}
function showIt() {
    popLayer.className = popStyle;
    popLayer.innerHTML = sPop;
    popWidth = popLayer.clientWidth;
    popHeight = popLayer.clientHeight;
    if (event.clientX + 12 + popWidth> document.body.clientWidth) popLeftAdjust = -popWidth - 24
    else popLeftAdjust = 0;
    if (event.clientY + 12 + popHeight> document.body.clientHeight) popTopAdjust = -popHeight - 24
    else popTopAdjust = 0;
    popLayer.style.left = event.clientX + 12 + document.body.scrollLeft + popLeftAdjust;
    popLayer.style.top = event.clientY + 12 + document.body.scrollTop + popTopAdjust;
}
document.onmouseover = showPopupText; </script>  
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