function popup( page, width, height, resize, scrollbars )
{
  if (!resize)
  {
  	resize = 'yes';
  }
  
  if (!scrollbars)
  {
  	scrollbars = 'no';
  }

  window.open( page, 'popup', 'toolbar=no,menubar=no,location=no,directories=no,status=no,scrollbars=' + scrollbars + ',resizable=' + resize + ',copyhistory=no,width=' + width + ',height=' + height + '');
}

function removeDefaultValue(element, value)
{
	if (document.getElementById(element).value)
	{
		if (document.getElementById(element).value == value)
		{
			document.getElementById(element).value = '';
		}
	}
}

function displayNavi(element_clicked, other_elements)
{
	for (i = 0; i < other_elements.length; i++)
	{
		if (document.getElementById(other_elements[i]))
		{
			document.getElementById(other_elements[i]).style.display = 'none';
		}
	}
	if (document.getElementById(element_clicked))
	{
		document.getElementById(element_clicked).style.display = 'block';
	}
}