sina的lightbox效果。

答案：使用时，只需要在A标签处加上rel="lightbox"即可。e.g: 
<A href=>
我自己也写了一个，不过涉及两个模块，（func.js公用库，和imagesLoader.js图片载入类）过阵子一并发上来。 
<STYLE type=text/css> 
 HTML #overlay { 
 FILTER: Alpha(opacity=50); BACKGROUND-IMAGE: url(images/blank.gif); BACKGROUND-COLOR: #000 
} 
</STYLE> 
<SCRIPT language=javascript type=text/javascript> 
<!--// 
function addEvent(object, type, handler) 
{ 
 if (object.addEventListener) { 
 object.addEventListener(type, handler, false); 
 } else if (object.attachEvent) { 
 object.attachEvent(['on',type].join(''),handler); 
 } else { 
 object[['on',type].join('')] = handler; 
 } 
} 
function WindowSize() 
{ // window size object 
 this.w = 0; 
 this.h = 0; 
 return this.update(); 
} 
WindowSize.prototype.update = function() 
{ 
 var d = document; 
 this.w =  
 (window.innerWidth) ? window.innerWidth 
 : (d.documentElement && d.documentElement.clientWidth) ? d.documentElement.clientWidth 
 : d.body.clientWidth; 
 this.h =  
 (window.innerHeight) ? window.innerHeight 
 : (d.documentElement && d.documentElement.clientHeight) ? d.documentElement.clientHeight 
 : d.body.clientHeight; 
 return this; 
}; 
function PageSize() 
{ // page size object 
 this.win = new WindowSize(); 
 this.w = 0; 
 this.h = 0; 
 return this.update(); 
} 
PageSize.prototype.update = function() 
{ 
 var d = document; 
 this.w =  
 (window.innerWidth && window.scrollMaxX) ? window.innerWidth + window.scrollMaxX 
 : (d.body.scrollWidth > d.body.offsetWidth) ? d.body.scrollWidth 
 : d.body.offsetWidt; 
 this.h =  
 (window.innerHeight && window.scrollMaxY) ? window.innerHeight + window.scrollMaxY 
 : (d.body.scrollHeight > d.body.offsetHeight) ? d.body.scrollHeight 
 : d.body.offsetHeight; 
 this.win.update(); 
 if (this.w < this.win.w) this.w = this.win.w; 
 if (this.h < this.win.h) this.h = this.win.h; 
 return this; 
}; 
function PagePos() 
{ // page position object 
 this.x = 0; 
 this.y = 0; 
 return this.update(); 
} 
PagePos.prototype.update = function() 
{ 
 var d = document; 
 this.x = 
 (window.pageXOffset) ? window.pageXOffset 
 : (d.documentElement && d.documentElement.scrollLeft) ? d.documentElement.scrollLeft 
 : (d.body) ? d.body.scrollLeft 
 : 0; 
 this.y = 
 (window.pageYOffset) ? window.pageYOffset 
 : (d.documentElement && d.documentElement.scrollTop) ? d.documentElement.scrollTop 
 : (d.body) ? d.body.scrollTop 
 : 0; 
 return this; 
}; 
function UserAgent() 
{ // user agent information 
 var ua = navigator.userAgent; 
 this.isWinIE = this.isMacIE = false; 
 this.isGecko = ua.match(/Gecko\//); 
 this.isSafari = ua.match(/AppleWebKit/); 
 this.isOpera = window.opera; 
 if (document.all && !this.isGecko && !this.isSafari && !this.isOpera) { 
 this.isWinIE = ua.match(/Win/); 
 this.isMacIE = ua.match(/Mac/); 
 this.isNewIE = (ua.match(/MSIE 5\.5/) || ua.match(/MSIE 6\.0/)); 
 } 
 return this; 
} 
// === lightbox === 
function LightBox(option) 
{ 
 var self = this; 
 self._imgs = new Array(); 
 self._wrap = null; 
 self._box = null; 
 self._open = -1; 
 self._page = new PageSize(); 
 self._pos = new PagePos(); 
 self._ua = new UserAgent(); 
 self._expandable = false; 
 self._expanded = false; 
 self._expand = option.expandimg; 
 self._shrink = option.shrinkimg; 
 return self._init(option); 
} 
LightBox.prototype = { 
 _init : function(option) 
 { 
 var self = this; 
 var d = document; 
 if (!d.getElementsByTagName) return; 
 var links = d.getElementsByTagName("a"); 
 for (var i=0;i<links.length;i++) { 
 var anchor = links[i]; 
 var num = self._imgs.length; 
 if (!anchor.getAttribute("href") 
 || anchor.getAttribute("rel") != "lightbox") continue; 
 // initialize item 
 self._imgs[num] = {src:anchor.getAttribute("href"),w:-1,h:-1,title:'',cls:anchor.className}; 
 if (anchor.getAttribute("title")) 
 self._imgs[num].title = anchor.getAttribute("title"); 
 else if (anchor.firstChild && anchor.firstChild.getAttribute && anchor.firstChild.getAttribute("title")) 
 self._imgs[num].title = anchor.firstChild.getAttribute("title"); 
 anchor.onclick = self._genOpener(num); // set closure to onclick event 
 } 
 var body = d.getElementsByTagName("body")[0]; 
 self._wrap = self._createWrapOn(body,option.loadingimg); 
 self._box = self._createBoxOn(body,option); 
 return self; 
 }, 
 _genOpener : function(num) 
 { 
 var self = this; 
 return function() { self._show(num); return false; } 
 }, 
 _createWrapOn : function(obj,imagePath) 
 { 
 var self = this; 
 if (!obj) return null; 
 // create wrapper object, translucent background 
 var wrap = document.createElement('div'); 
 wrap.id = 'overlay'; 
 with (wrap.style) { 
 display = 'none'; 
 position = 'fixed'; 
 top = '0px'; 
 left = '0px'; 
 zIndex = '50'; 
 width = '100%'; 
 height = '100%'; 
 } 
 if (self._ua.isWinIE) wrap.style.position = 'absolute'; 
 addEvent(wrap,"click",function() { self._close(); }); 
 obj.appendChild(wrap); 
 // create loading image, animated image 
 var imag = new Image; 
 imag.onload = function() { 
 var spin = document.createElement('img'); 
 spin.id = 'loadingImage'; 
 spin.src = imag.src; 
 spin.style.position = 'relative'; 
 self._set_cursor(spin); 
 addEvent(spin,'click',function() { self._close(); }); 
 wrap.appendChild(spin); 
 imag.onload = function(){}; 
 }; 
 if (imagePath != '') imag.src = imagePath; 
 return wrap; 
 }, 
 _createBoxOn : function(obj,option) 
 { 
 var self = this; 
 if (!obj) return null; 
 // create lightbox object, frame rectangle 
 var box = document.createElement('div'); 
 box.id = 'lightbox'; 
 with (box.style) { 
 display = 'none'; 
 position = 'absolute'; 
 zIndex = '60'; 
 } 
 obj.appendChild(box); 
 // create image object to display a target image 
 var img = document.createElement('img'); 
 img.id = 'lightboxImage'; 
 self._set_cursor(img); 
 addEvent(img,'click',function(){ self._close(); }); 
 addEvent(img,'mouseover',function(){ self._show_action(); }); 
 addEvent(img,'mouseout',function(){ self._hide_action(); }); 
 box.appendChild(img); 
 var zoom = document.createElement('img'); 
 zoom.id = 'actionImage'; 
 with (zoom.style) { 
 display = 'none'; 
 position = 'absolute'; 
 top = '15px'; 
 left = '15px'; 
 zIndex = '70'; 
 } 
 self._set_cursor(zoom); 
 zoom.src = self._expand; 
 addEvent(zoom,'mouseover',function(){ self._show_action(); }); 
 addEvent(zoom,'click', function() { self._zoom(); }); 
 box.appendChild(zoom); 
 addEvent(window,'resize',function(){ self._set_size(true); }); 
 // close button 
 if (option.closeimg) { 
 var btn = document.createElement('img'); 
 btn.id = 'closeButton'; 
 with (btn.style) { 
 display = 'inline'; 
 position = 'absolute'; 
 right = '10px'; 
 top = '10px'; 
 width = '15px'; 
 height = '15px'; 
 zIndex = '80'; 
 } 
 btn.src = option.closeimg; 
 self._set_cursor(btn); 
 addEvent(btn,'click',function(){ self._close(); }); 
 box.appendChild(btn); 
 } 
 // caption text 
 var caption = document.createElement('span'); 
 caption.id = 'lightboxCaption'; 
 with (caption.style) { 
 display = 'none'; 
 position = 'absolute';

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