function openPopUp(width,height,page) 
{
   var l = Math.floor((screen.width-width)/2);
   var t = Math.floor((screen.height-height)/2);
   window.open(page,"","width=" + width + ",height=" + height + ",top=" + t + ",left=" + l + ",status=no,menubar=no,toolbar=no,scrollbar=yes");
 }

function changeConcertsDisplayedBox(idBox) 
{
	document.getElementById('concerts2007Box').style.display = 'none';
 	document.getElementById('concerts2008Box').style.display = 'none';
	document.getElementById('concerts2009Box').style.display = 'none';
	document.getElementById('concerts2010Box').style.display = 'none';
	document.getElementById('concerts2011Box').style.display = 'none';
	document.getElementById('concerts2012Box').style.display = 'none';
 	document.getElementById(idBox).style.display = 'block';
}

function changePhoto(photoName, photoTitle)
{
  document.getElementById('photoImage').src = 'photos/' + photoName + '.jpg';
  document.getElementById('photoTitle').innerHTML = photoTitle;
}