function toggleVisibility(item, visible)
{
	AdjustPosition(item);
	document.getElementById(item).style.display=visible;
}

function toggleVisibilityNoMove(item, visible)
{
	document.getElementById(item).style.display=visible;
}

function AdjustPosition(elementName)
{
  var IpopTop = (document.body.clientHeight - document.getElementById(elementName).offsetHeight) / 2;
  var IpopLeft = (document.body.clientWidth - document.getElementById(elementName).offsetWidth) / 2;
   
  document.getElementById(elementName).style.left=IpopLeft + document.body.scrollLeft;
  document.getElementById(elementName).style.top=IpopTop + document.body.scrollTop - 150;
}