function swap(id) {
  //alert(id);
  if (document.getElementById) {
    document.getElementById('photo1').style.display = "none";
    document.getElementById('photo2').style.display = "none";
    document.getElementById('photo3').style.display = "none";
    document.getElementById('photo4').style.display = "none";
    document.getElementById('photo5').style.display = "none";
    document.getElementById(id).style.display = "block";
  } else if (document.all) {
    document.all['photo1'].style.display = "none";
    document.all['photo2'].style.display = "none";
    document.all['photo3'].style.display = "none";
    document.all['photo4'].style.display = "none";
    document.all['photo5'].style.display = "none";
    document.all[id].style.display = "block";
	} else if (document.layers) {
	  document.layers['photo1'].display = "none";
	  document.layers['photo2'].display = "none";
	  document.layers['photo3'].display = "none";
	  document.layers['photo4'].display = "none";
	  document.layers['photo5'].display = "none";
	  document.layers[id].display = "block";
	}
}