function imgResize(obj){
if (obj.width >= obj.height)
{
    if (obj.width > obj.parentElement.width)
    {obj.height = obj.height * (obj.parentElement.width/obj.width);
     obj.width = obj.parentElement.width;
     if (obj.height > obj.parentElement.height)
         {obj.width = obj.width * (obj.parentElement.height/obj.height);
          obj.height = obj.parentElement.height;}
     }
}
else if (obj.height > obj.parentElement.height)
      {obj.width = obj.width * (obj.parentElement.height/obj.height);
       obj.height = obj.parentElement.height;
       if (obj.width > obj.parentElement.width)
          {obj.height = obj.height * (obj.parentElement.width/obj.width);
           obj.width = obj.parentElement.width;}
       }
}