javascript鼠标移动显示图片特效代码

//***********默认设置定义.*********************  
tPopWait=50;//停留tWait豪秒后显示提示。  
tPopShow=5000;//显示tShow豪秒后关闭提示  
showPopStep=20; 
popOpacity=99; 
 
//***************内部变量定义*****************  
sPop=null; 
curShow=null; 
tFadeOut=null; 
tFadeIn=null; 
tFadeWaiting=null; 
 
document.write("<mce:style type='text/css'id='defaultPopStyle'><!-- 
"); 
document.write(".cPopText { line-break : normal;word-break : break-all ; background-color: #FEFCF3;color:#000000; border: 1px #E7B68C solid;padding-top: 2px; padding-right: 4px; padding-left: 4px; padding-bottom: 2px;font-size: 12px;width:96px; filter: Alpha(Opacity=0)}"); 
document.write(" 
--></mce:style><style type='text/css'id='defaultPopStyle' mce_bogus="1">"); 
document.write(".cPopText { line-break : normal;word-break : break-all ; background-color: #FEFCF3;color:#000000; border: 1px #E7B68C solid;padding-top: 2px; padding-right: 4px; padding-left: 4px; padding-bottom: 2px;font-size: 12px;width:96px; filter: Alpha(Opacity=0)}"); 
document.write("</style>"); 
document.write("<div id='dypopLayer' style="position:absolute;z-index:1000;" mce_style="position:absolute;z-index:1000;" class='cPopText'></div>"); 
 
function showPopupText(){ 
var o=event.srcElement; 
    MouseX=event.x; 
    MouseY=event.y; 
    if(o.alt!=null && o.alt!=""){o.dypop=o.alt;o.alt=""}; 
if(o.title!=null && o.title!=""){o.dypop=o.title;o.title=""}; 
    if(o.dypop!=sPop) { 
    sPop=o.dypop; 
    clearTimeout(curShow); 
    clearTimeout(tFadeOut); 
    clearTimeout(tFadeIn); 
    clearTimeout(tFadeWaiting);  
    if(sPop==null || sPop=="") { 
dypopLayer.innerHTML=""; 
dypopLayer.style.filter="Alpha()"; 
dypopLayer.filters.Alpha.opacity=0;  
} 
    else { 
if(o.dyclass!=null) popStyle=o.dyclass  
    else popStyle="cPopText"; 
curShow=setTimeout("showIt()",tPopWait); 
    } 
 
    } 
} 
 
function showIt(){ 
dypopLayer.className=popStyle; 
dypopLayer.innerHTML=sPop; 
popWidth=dypopLayer.clientWidth; 
popHeight=dypopLayer.clientHeight; 
if(MouseX+12+popWidth>document.body.clientWidth) popLeftAdjust=-popWidth-24 
    else popLeftAdjust=0; 
if(MouseY+12+popHeight>document.body.clientHeight) popTopAdjust=-popHeight-24 
    else popTopAdjust=0; 
 
dypopLayer.style.left=MouseX+12+document.body.scrollLeft+popLeftAdjust; 
dypopLayer.style.top=MouseY+12+document.body.scrollTop+popTopAdjust; 
dypopLayer.style.filter="Alpha(Opacity=0)"; 
fadeOut(); 
} 
 
function fadeOut(){ 
    if(dypopLayer.filters.Alpha.opacity<popOpacity) { 
dypopLayer.filters.Alpha.opacity+=showPopStep; 
tFadeOut=setTimeout("fadeOut()",1); 
} 
else { 
    dypopLayer.filters.Alpha.opacity=popOpacity; 
    tFadeWaiting=setTimeout("fadeIn()",tPopShow); 
    } 
} 
 
function fadeIn(){ 
    if(dypopLayer.filters.Alpha.opacity>0) { 
dypopLayer.filters.Alpha.opacity-=1; 
tFadeIn=setTimeout("fadeIn()",1); 
} 
} 
document.onmouseover=showPopupText; 
 

<a href="../UpLoadFile/200911784060017.jpg" target="_blank" title="<img src=../UpLoadFile/200911784060017.jpg  />">大</a>
<a href="../UpLoadFile/200911784060018.jpg" target="_blank" title="<img src=../UpLoadFile/200911784060018.jpg width=96 height=70 />">小</a>