function calcBirdsHeight()
{  
  var the_height = document.getElementById('birds_iframe').contentWindow.document.body.scrollHeight;
  if (the_height <= 585) {
    document.getElementById('birds_iframe').height = the_height;
  }
  else {
    document.getElementById('birds_iframe').height = 585;
  } 
}

function calcPhotosHeight()
{
  var the_height = document.getElementById('photos_iframe').contentWindow.document.body.scrollHeight; 
  document.getElementById('photos_iframe').height = the_height; 
}

function calcProductsHeight()
{
  var the_height = document.getElementById('products_iframe').contentWindow.document.body.scrollHeight;
  if (the_height <= 585) {
    document.getElementById('products_iframe').height = the_height;
  }
  else {
    document.getElementById('products_iframe').height = 585;
  }
}

function calcRetailersHeight()
{
  var the_height = document.getElementById('retailers_iframe').contentWindow.document.body.scrollHeight;
  if (the_height <= 585) {
    document.getElementById('retailers_iframe').height = the_height;
  }
  else {
    document.getElementById('retailers_iframe').height = 585;
  }
}