//------ Developer Jonhor@163.com ------

var flag=false;
function ImgZoom(Img,MaxW,MaxH){
 var image=new Image();
 image.src=Img.src;
 if(image.width>0 && image.height>0){
  flag=true;
  if(image.width/image.height>=MaxW/MaxH){
   if(image.width>MaxW){
    Img.width=MaxW;
    Img.height=(image.height*MaxW)/image.width;
   }else{
    Img.width=image.width;
    Img.height=image.height;
   }
  }
  else{
   if(image.height>MaxH){
    Img.height=MaxH;
    Img.width=(image.width*MaxH)/image.height;
   }else{
    Img.width=image.width;
    Img.height=image.height;
   }
  } 
 }
}

//------ Developer Jonhor@163.com ------