function SetProductImage()
{
  var WidthDiff, HeightDiff

  WidthDiff = ProductImg.width - 300;
  HeightDiff = ProductImg.height - 240;
  
  if (WidthDiff > HeightDiff)
  {
    WidthDiff = (300/ProductImg.width);
    ProductImg.width = ProductImg.width * WidthDiff;
  }
  else
  {
    HeightDiff = (240/ProductImg.height);
    ProductImg.height = ProductImg.height * HeightDiff;
  }
}