function MM_findObj(n, d) { //v4.01
  var p,i,x;  
  if(!d) d=document; 
  if((p=n.indexOf("?"))>0&&parent.frames.length) 
  {
    d=parent.frames[n.substring(p+1)].document; 
    n=n.substring(0,p);
  }
  if(!(x=d[n])&&d.all) x=d.all[n]; 
  for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function Wa_SetImgAutoSize(Width,Height,imgID) 
{
 //var j=0,img;document.MM_sr=new Array;
 //if ((img=MM_findObj(imgID))!=null){document.MM_sr[j++]=img;}//获取图片
 var img=document.getElementById(imgID);//获取图片
 var MaxWidth=Width;//设置图片宽度界限
 var MaxHeight=Height;//设置图片高度界限
 var HeightWidth=img.offsetHeight/img.offsetWidth;//设置高宽比
 var WidthHeight=img.offsetWidth/img.offsetHeight;//设置宽高比
 //alert(img.load);
 //if(img.readyState!="complete")return false;//确保图片完全加载 
 if(img.offsetWidth>MaxWidth){
  img.width=MaxWidth;
  img.height=MaxWidth*HeightWidth;
 }
 if(img.offsetHeight>MaxHeight){
  img.height=MaxHeight;
  img.width=MaxHeight*WidthHeight;
 }
 return false;
}