求注释

 
大家能帮我把这段js文件注释一下吗  // JScript 文件 以下代码来自iwms//***
//图片缩小
function ImgLoad(obj)
{
var imgs = obj.getElementsByTagName("img");
for(var i=0;i<imgs.length;i++){
var o=imgs[i];
if(o.complete){
ImgLoaded(o);
}else{
o.onload=function(){ImgLoaded(this);};
}
// 点图片下一页
var gp = document.getElementById("goPage");
if (gp && imgs.length==1 && o.width>200){
o.style.cursor="pointer";
if (o.resized=="1"){
o.setAttribute("title","ctrl+鼠标左键原大小");
o.onclick=function(eventTag){var evt=eventTag||window.event;evt.ctrlKey ? ImgSize(this) : pager.Next()};
}else{
o.onclick=function(){pager.Next()};
}
}
}
}function ImgLoaded(o){
if (o.width>imgMaxWidth){
if (o.style.width){
o.style.width="";
}
o.owidth=o.width; // 保留原大小
o.oheight=o.height;
o.width=imgMaxWidth;
o.removeAttribute("height");
o.setAttribute("title","点击原始大小查看");
o.style.cursor="pointer";
o.style.display="block";
o.vspace=5;
o.resized=1;
if (typeof(o.onclick)!="function"){
o.onclick=ImgClick;
}
// o.onmousewheel=bbimg;
}
}function ImgSize(oImg){
if (oImg.parentElement){
if (oImg.parentElement.tagName=="A"){
return;
}
}
var imgDiv,bgDiv,bodyH,bodyW,winW,winH;
bgDiv=document.getElementById("iwmsBImg");
imgDiv=document.getElementById("iwmsFImg");
bodyH=document.documentElement.scrollHeight;
bodyW=document.documentElement.scrollWidth;
if (self.innerHeight) { // all except Explorer
winW = self.innerWidth;
winH = self.innerHeight;
}else if(document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
winW = document.documentElement.clientWidth;
winH = document.documentElement.clientHeight;
}else if(document.body) { // other Explorers
winW = document.body.clientWidth;
winH = document.body.clientHeight;
}

if (bgDiv==undefined){
bgDiv=document.createElement("DIV");
bgDiv.id="iwmsBImg";
bgDiv.style.position="absolute";
bgDiv.style.left="0px";
bgDiv.style.top="0px";
// bgDiv.style.filter="alpha(opacity=85)";
// bgDiv.style.opacity="0.85";
bgDiv.style.height=bodyH+"px";
bgDiv.style.width=bodyW+"px";
bgDiv.style.background="#000";
document.body.appendChild(bgDiv);
}
if (imgDiv==undefined){
imgDiv=document.createElement("DIV");
imgDiv.id="iwmsFImg";
imgDiv.style.position="absolute";
imgDiv.style.top="10px";
imgDiv.style.border="1px solid #666"
imgDiv.style.background="#000";
imgDiv.style.padding="8px"
imgDiv.onclick=function(){this.style.display='none';document.getElementById("iwmsBImg").style.display='none';};
imgDiv.onmousewheel=bbimg;
imgDiv.title="ctrl+鼠标滚轮缩放\r\n点击图片隐藏";
document.body.appendChild(imgDiv);
}
imgDiv.style.display="";
bgDiv.style.display="";
if(bodyW>oImg.owidth){
imgDiv.style.left=(bodyW-oImg.owidth)/2+"px";
}else{
imgDiv.style.left="0px";
}
if(winH>oImg.oheight+22){
imgDiv.style.top=(document.documentElement.scrollTop+(winH-oImg.oheight)/2-11)+"px";
}else{
imgDiv.style.top=(document.documentElement.scrollTop+10)+"px";
}

imgDiv.innerHTML="<img src='"+ oImg.src +"'/>";
}function ImgClick()
{
ImgSize(this);
}//图片缩放
function bbimg()
{
if (event.ctrlKey){
var zoom=parseInt(this.style.zoom, 10)||100;
zoom+=event.wheelDelta/12;
if (zoom>0) this.style.zoom=zoom+'%';
return false;
}else{
return true;
}
}