function toggle(id)
{
 ul = "ul_" + id;
 img = "img_" + id;
 ulElement = document.getElementById(ul);
 imgElement = document.getElementById(img);
 
 
 if (ulElement)
 { 
  	if (ulElement.className == 'closed')
	{
	   ulElement.className = 'open';
	   imgElement.src = "/scripts/open.gif";
	}
	else
	{
	   ulElement.className = 'closed';
	   imgElement.src = "/scripts/closed.gif";
	}
  }
}