一个链接TITLE的效果

var sPop = null;
document.write("<style type='text/css'>");
document.write(".PopText { font-family: Tahoma, 宋体; color: #000000; background-color: #f7f7f7; 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(" ","<br>"); 
            o.pop=o.pop.replace(" ","<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;